9-April-2012:

	In the FuG120 Bernhardine Hellschreiber section of the "Hellschreibers from other manufacturers" page, I have added a short 1946 film clip of the "Bernhard" installation at La Pernelle (Normandie, France).
	On the "Articles, literature, documentation" page, I added the de-classified 1946 (1942?) US-translation of the 1940 Feld-Hell training pamphlet of the Wehrmacht Signal Corp School (look for ).
	On the Post-war Feld-Hell built in Hungary page, I have added a handful of photos of the inside of the amplifier box, the entire machine, keyboard, printer, and carrying case.

18-February-2012: Finally finished the "Markings on Feld-Hell machines" page!

3-February-2012: I have added a dedicated page about some Feld-Hell design evolutions.

20-January-2012: for your reading pleasure:

	On the "Other Siemens-built Hellschreibers" page, I have significantly corrected and expanded the section on the Hell Blattschreiber (page/sheet-printer).
	In the "Hell ZETFAX" section of the "Hellschreibers built by the Hell Company" page, I have added some description text and 2 maintenance documents (courtesy Arie, PE1AQB).
	On the "Hellschreibers from other manufacturers" page, I have added a complete section about the Swiss ETK direct-printing teleprinter system, as it is related to the Hell system in several ways.
	On the "Rudolf Hell: history and patents" page, I have added text about the radio callsign of the Hell company.
	On the "Maintenance" page, I have added a circuit diagram (schematic) for testing the Feld-Hell motor-generator and printer solenoid - without the Feld-Hell's amplifier box.
	On the "Hell "Feld Morseschreiber"" page, I have added a series of photos of the Hell RC 28 Morse telegraphy printer.

1-January-2012: Happy New Year! For your reading pleasure, I have added a dozen or two documents. They are spread out over the entire website. Just check your favorite page(s) and look for . Some other changes:

	The TBs24b page has been expanded with some diagrams and text.
	On the "Hell 72 "GL" and Hell 73 "AGL" page, schematics have been added for models 72a, 72b, 72c, 73 AGL .
	The "Presentations" section has been moved from the "Feld Hell" sub-menu to "Articles, literature, documentation" on the main menu (now renamed to: "Articles, documentation, presentations").
	On the "Other Siemens-built Hellschreibers" page, I have added a section on a Hellschreiber-printer that was made for testing speed & distortion of teletype ("telex") start-stop teleprinters.
	I have started a new page, about a Feld-Hell derivative machine, that was built post-war in Hungary.
	On the "Frequencies, nets, museums, beacons" page, I have added 2 museums in Canada to list of museums with Hellschreibers in their collection.
	Finally, I have just started (i.e., a lot of work still to be done!) a separate page for "Radio transmitters & receivers used with the Feld-Hell". This used to be a subsection of the Feld-Hell "Performance" page, but began to grow to the extent that it warranted a separate page. Note that the discussion of "Presse Hell" receivers remains on the "Radio receivers used with "Presse Hell" page.

3-November-2011: added several documents on the "Articles, literature, documentation" page (look for ). This includes a 1940 Feld-Hell training leaflet of the Heeresnachrichtenschule (Army Signal Corps School), and a 1944 English article. Also added some references on the "Presse Hell" page (look for ). Added group photo of the 2011 Hell Meeting on the "Annual Hell Meeting" page. Took some 3D photos of German equipment at that meeting, and posted them on the "3D (stereoscopic) photos" page (get your red/green glasses ready!). Added a short video clip of the spinning Feld-Hell's character drum on the "The Hell system - how it works" page (here) and on the the "Hellschreiber fonts" page. At the bottom of the latter page, I added photos of a 1940s optical disk record player.

16-October-2011: you can now subscribe to an RSS-feed with the changes listed on this page, and get them delivered automatically to your RSS-reader (your separate feed-reader, or the one integrated in your web browser, Outlook, etc.). To subscribe, click here, or on the RSS-feed icon at the top-right of this page. 

14-October-2011: I recently got information about Hell-printers made during the 1940s by F.I.A.T. in Italy, and by the British Post Office. I have started sections for them on the "Hellschreibers from other manufacturers" page. The various sections related to "Presse Hell" (the original system developed by Rudolf Hell for news agencies) and associated equipment, have grown to the extent that I decided to group them as a separate item on the main menu: "Presse Hell".

9-October-2011: at the bottom of the "Articles, literature, documentation" page, added several documents with translations of German military radio (and other) abbreviations & terminology (look for  ).

30-September-2011: on the "Hellschreibers from other manufacturers" page, I started a section on the optically scanning Hellschreiber system of the Toho Denki company in Japan. I basically have no info on this - if you do, please contact me! Also added some stuff in the "ZETFAX" section of the "Hellschreibers built by the Hell Company" page.

24-September-2011: uploaded the 1940 Luftwaffe Feld-Hell manual L.Dv. 702/1 Heft 213 to the "Articles, literature, documentation" page (look for ). It is the counterpart of the ubiquitous 1940 Wehrmacht document D 758/1.

18-30-September-2011: Expanded the news agency write-up in the "T empf 12 / Presse Hell" section of the "Other Siemens Hellschreibers" page, incl. added documents (look for  and   )). Added WW2 photo on the "Historical photos" page (look for ).

2-August-2011: Major changes/updates! I have decided to consolidate all discussions and examples of Hellschreiber fonts on a single page "Hellschreiber fonts" (see main menu) - with additional information. The "what it is and how it works" discussion used to be included in the main Feld-Hell function/operation page. However, most of it applies to all types of Hellschreiber. So I have put all the generic discussions and illustrations on a new page "The Hell system - how it works" (see top of the main menu). This page also has a number of additions and overhauls. The page with Feld-Hell specific stuff is now called "The Feld-Hell machine" (still on the "Feldfernschreiber" sub-menu).

23-July-2011: the fonts used with the various Hellschreiber systems are now consolidated on the "Hellschreiber fonts" page, together with the associated font-memory technologies (mechanical, magnetic, optical).

18-July-2011: the Hell company also built "Morseschnellschreiber" - high-speed Morse telegraphy recorders (printers), based on Hellschreiber technology. So I decided to to illustrate this on a separate page (also accessible via the "The Feld-Hell machine" - towards the bottom of that page).

9 July 2011: on the "Articles, literature, documentation" page, added "Der Typenbildschreiber Tbs 24a – 32", a very interesting personal Hellschreiber manual, written in 1940 by Rudolf Heinrich, soldier in the Signal Corps of the Wehrmacht; look for  . Added extracts from it, on the "original telegrams" page.

2 July 2011: on the "Rudolf Hell: history and patents" page, added a short video clip of Rudolf Hell, several audio clips of Rudolf Hell talking about his life, and a radio documentary about his life (all in German). On the "Articles, literature, documentation" page, added 1 document in German (1935, about T empf 12), and 1 article in French (2011); look for  . On the "Other Siemens Hellschreibers" page, expanded the section on the the T empf 12 and T empf 14 "Presse Hell". Consolidated description of Hellschreiber peripherals (punch tape readers/senders, keying amplifiers, etc. on a new page of the "Other Hellschreiber models" menu: "Siemens Hellschreiber peripherals".

1 July 2011: consolidated 1937-1944 Hellschreiber equipment prices on a separate page: via the menu under "Other Hellschreiber models", then "Original Siemens Hell equipment prices".

27-Jun-2011: added a new page for a derivative of the Feld-Hell machine. The existence of this model was only very recently brought to my attention!

26-June-2011: on the "Articles, literature, documentation" page, uploaded 2 Italian documents from 1941. See

3-June-2011: on the "Articles, literature, documentation" page, uploaded 6 German documents, 1931-1959. See ; consolidated original Hellschreiber telegrams on a new page "original telegrams".

24-May-2011: on the "Hellschreibers from other manufacturers" page, added a section on the Hellschreiber built by P.T.W. in Austria. In the section on the FuG120 Bernhardine Hellschreiber, expanded text about the early Bernhard system, added my photos of remnants of the Bernhard station at Pouzauges. On the "Production Volume" page, updated the graph and some conclusions on the 77 machines currently in my database. In the Goliath transmitter section of the "Performance" page, expanded text and added a photo.

6&7-May-2011: in the section on the FuG120 Bernhardine Hellschreiber, added 8 photos of the HS120 printer, a video clip of the printer in action, and expanded some of the associated text. On the "Other Siemens Hellschreibers" page, added photos of a T empf 14 "Presse Hell", its printout, and a short video clip of the printer in action. On the "Hellschreibers from other manufacturers" page, added print-out and video clip of the NVA Hellschreiber; added the EMA Hell-printer type HSG2; added the Creed Teletape fax machine I took some 3D photos of the T empf 14 , an NVA Hell, and an Enigma crypto machine, and decided to consolidate all my Hell-related 3D photos on a single "3D (stereoscopic) photos" page.

2-May-2011: Last weekend, I gave a Hellschreiber-presentation (in German) at the annual meeting of the Funkhistorischer Interessenkreis. I have posted the presentation on the "Presentations" page.

25-April:-2011: created a separate section for Hellschreibers built by the Hell Company, and moved the EH5, EH6, U-boat, and Zetfax there, and added an illustrated discussion of the NS and NS3 Hellschreibers. On the "Components and construction" page, added a section on NSF ( mfr of capacitors used in the Feld-Hell), and added some detail to the Mende Co. write-up.

24-April:-2011: in the section on the FuG120 Bernhardine Hellschreiber, expanded text about transmitter-antenna coupling, installation in Me-262 aircraft, description of E Bl 3 receiver, added some references.

23-April:-2011: on the "Hell-80" page, added results from extensive tests to characterize timing of the start-pulse detection and associated printer enabling of Hell-80 machines in start-stop mode.

2-April:-2011: the date and location of this year's "Annual Hell Meeting" has been announced. Please join us!

31-Mar-2011: Rolls of Hellschreiber paper tape for sale. I recently had a factory do a special order of rolls. I have a number of rolls left, and I am selling them in packages of 16. Price obviously depends on the shipping destination. Contact me for further info.

22-Mar-2011: in the section on the FuG120 Bernhardine Hellschreiber, added numerous info items about the Bernhard station at Buke. In the Goliath transmitter section of the "Performance" page, added info about the Hein, Lehmann & Co, antenna construction compmany.

12-Mar-2011: on the "Articles, literature, documentation" page, added 2 articles in Swedish and the first document in Finnish (see )

30-Jan-2011: on the main page, added a search-engine specifically for this website.

22-Jan-2011: in the section on the FuG120 Bernhardine Hellschreiber, expanded the description of the Wachsschreiber. On the "Performance" page, added a section on the 1 Megawatt Goliath transmitter, used for Hellschreiber messages.

18-Jan-2011: on the "Markings on Feld-Hell machines" page, expanded the section on BAL-stamps. On the "Hell software & PC-interfacing", added EREL Hell software for testing Hellschreiber machines (all modes).

15-Jan-2011: added maps with the location of "Bernhard" FuSAn 724/725 ground stations, in the section on the FuG120 Bernhardine Hellschreiber.

11-Jan-2011: on the "Frequencies, contests, nets, museums, balloon beacons " page, expanded the list of museums with a Hellschreiber with the Armémuseum in Stockholm/Sweden, the Radio & Telephone Museum in Petäjävesi/Finland, and the Fernmeldemuseum of the Army Signals School in Vienna/Austria.

29-Dec-2010: on the "Maintenance" page, added troubleshooting of the anode voltage supply of the motor-generator to the Feld-Hell electronics box.

27-Dec-2010: expanded the Feld-Hell "Accessories" page with the FF-33 field telephone, and headphones.

20-Dec-2010: on the "Other Siemens Hellschreibers" page, overhauled and completed the section on the FuG120 Bernhardine Hellschreiber .

19-Dec-2010: On the "Other Siemens Hellschreibers" page, added numerous photos of 1930s Hell equipment to top section of the page. On the "Hellschreiber radio receivers" page, started sections on Telefunken E415, E376, and E515 receivers.

17-Dec-2010: in the Hell Feldfernschreiber ("Feld Hell") section, started page on "Communication performance" (wired & wireless); included 15W.S.E.b transceiver with Feld-Hell interface.

8-Dec-2010: on the "Frequencies, contests, nets, museums, balloon beacons" page, updated the starting time of the weekly Sunday Hell Net on 80 mtrs. In the Hell Feldfernschreiber ("Feld Hell") section, added write-up about die-cast "Elektron" metal chassis to the "Components and construction" page. Added message from Gerd, OE3GSA, to the "Comments from visitors" page.

2-Dec-2010: on the "Photos" page, added photos of the die-cast electronics box, all components removed

1-Dec-2010: added a separate "Components and construction" page, and included photos of bare electronics box. Moved "Components" section of the "Electronics and schematics" page there.

30-Nov-2010: added a printer by Broni Luca, IZ6HPJ, to the Homebuilt Printers page; in the Hell Feldfernschreiber ("Feld Hell") section, added photos of the bare electronics box to the photos page.

29-Nov-2010: on the "Industry and technology 1920-1945", added several documents.

20-Nov-2010: in the Hell Feldfernschreiber ("Feld Hell") section, started a separate Feld-Hell accessories on "Feld-Hell accessories" page and added photos; added Dralowid to the component manufacturers section of the circuitry and components page.

19-Nov-2010: on the "Markings on Feld-Hell machines" page, added section on miscellaneous markings; added several WaA stamp photos.

13-Nov-2010: added section on Hellschreiber balloon beacons to the to the "Frequencies, contests, nets, museums, balloon beacons" page

11-Nov-2010: added 3 documents to the literature page, and info from them on the Hell-80 page. On the "Articles, literature, documentation" page, added 3 German (1934, 1960s) and 1 Swedish document (1945). On the "Hell-80" page, added two documents, and some info extracted from them.

3-Nov-2010: on the "Frequencies, contests, nets, museums, balloon beacons" page, added section on balloon beacon launches.

2-Nov-2010: on the "Other Siemens Hellschreibers" page, added placeholder sections for Hell Tempf 12 and a Hell printer used on U-boats.

31-Oct-2010: on the "Rudolf Hell: history and patents" page, added ref. 46 about Siemens-Halske logo, and 47 about Reuters. On the "Articles, literature, documentation" page, added Italian document.

16-Oct-2010: on the "Frequencies, contests, nets, museums, balloon beacons" page, moved Annual Hell Meeting section to separate page.

11-Oct-2010: added photo and text about the 33rd Annual Hell Meeting of 9-Oct-10 to the Frequencies, contests, nets, annual meeting, museums page. On the "Homebuilt Hell-printers" page, added modular printer for synchronous & start-stop Hell-80 by Arie, PE1AQB.

25-Sept-2010: added 1943 Italian Feld-Hell telegram to the "Rudolf Hell: history and patents" page, uploaded major reference on "Markings on Feld-Hell machines" page, added & uploaded several references to "RV 12 P 4000 tube" page, added WWII photos to "Photos" page, and added and uploaded several references.. On the "Bandwidth and duty cycle" page, added ref. 16. On the "Articles, literature, documentation" page, added 4 articles in English

19-Sept-2010: on the "Markings on Feld-Hell machines" page, uploaded major ref. 1.

5-Sept-2010: on the "Rudolf Hell: history and patents" page, added 1943 Italian Feld-Hell telegram.

1-Sept-2010: added photos of the printer recently built by Jan Smeets (his second one) to the "Homebuiltprinters" page.

30-Aug-2010: put discussion of Feld-hell production volume on this separate page.

29-Aug-2010: on the "Electronic circuitry and schematics" page, expanded description of detector circuit and final amplifier tube bias. On the "Markings on Feld-Hell machines" page, added section on markings on the Feld-Hell electronics box and Motor-Generator.

28-Aug-2010: on the "RV 12 P 4000" page, added photos of a 1935 RV12P4000 with with ceramic base.

22-Aug-2010: on the "Hellschreiber radio receivers" page, added section on Telefunken Ae 1076 receiver.

16-Aug-2010: on the "Photos" page, added photos at top of the historical photos section.

12-August-2010: on the "Articles, literature, documentation" page, added 1 article in Brazilian , and 1 in Spanish.

22-July-2010: on the "Articles, literature, documentation" page, added 1 Danish and 13 Swedish documents.

21-July-2010: added RCA section to Hellschreibers from other manufacturers page. On the "Photos" page, added photos of spare carbon brushes etc.

14-July-2010: on the "Frequencies, contests, nets, museums, balloon beacons" page, added list of museums with Hellschreiber.

6-July-2010: on the "Markings on Feld-Hell machines" page, expanded text on the Wehrmacht.

9-July-2010: added about a dozen articles to the Articles, literature, documentation page.

1-July-2010: expanded "My Feld-Hell machine" page with text about number of produced and surviving machines. Added separate page with "feedback from visitors".

30-June-2010: on the "Articles, literature, documentation" page, added 1 Czech (1974) and 1 Swiss/German document (1944).

23-June - 7-July-2010: on the "RV 12 P 4000" page, expanded text on Waffenamt stamps and other markings.

21-June-2010: on the "Rudolf Hell: history and patents" page, added ref. 43 & 44 about Prof. Dieckman. Started separate "Markings on Feld-Hell machines" page, consolidated discussion of Waffenamt and other markings on the Feld-Hell here from several pages, expanded the text, added illustrations.

18-June-2010: put WaA markings on a new page "Markings on Feld-Hell machines (incl. Waffenamt stamps)"

15-June-2010: on the "Interfaces to a transceiver" page, expanded description of CW rig interface. On the "Hellschreiber software" page, added description of PC interface to a CW transmitter.

12-June-2010: on the "Homebuilt Hell-printers" page, added several literature references for narrow AF filters.

11-June-2010: added a separate page about "Bandwidth and duty cycle".

9-June-2010: on the "Links" page, added Radiomuseum.org link.

8-June-2010: on the "Articles, literature, documentation" page, added 2 English (1978, 1983) and 1 German article (1962). On the "Other Siemens Hellschreibers" page, added Blattschreiber ref. 7 and 8.

4-June-2010: on the "RV 12 P 4000" page, added photos of all tube parts + text + 3D photos; added separate page for photos and notes on all my RV12P4000 tubes; added refs. 24-48.

2-June-2010: added photos of all tube parts to the "The RV12P4000 tube" page, and 3D's of RV12P4000 tube to the "3D photos" page.

9-May-2010: on the "RV 12 P 4000" page, expanded text; added TeKaDe knob picture.

5-May-2010: on the "Presentations" page, added link to instructions for scrolling banner with Hell font.

3-May-2010: on the "Other Siemens Hellschreibers" page, corrected & expanded description of the Blattschreiber, added photos.

24-Apr-2010: on the "Rudolf Hell: history and patents" page,added photos of Hell Werke and ref. 38, 39. On the "Electronic circuitry and schematics" page, expanded product and company info for Jahre, Jaroslaw, Römmler; added Sirutor references.

14-Apr-2010: on the "How it works" page, added downloadable Feld-Hell TrueType fonts.

11-Apr-2010: on the "Other Siemens Hellschreibers" page, added T empf 14 schematic; moved Hell radio receivers to separate page.

6-Apr-2010: started the "Industry and technology 1920-1945" page.

5-Apr-2010: on the "3D photos" page, added 3D of RV12P4000 tubes.

30-March-2010: on the "RV 12 P 4000" page, added picture of tube socket and markings; expanded text on WaA and BAL stamps. On the "Hell software & PC interfacing" page, added waterfall spectra.

26-Mar-2010: on the "Rudolf Hell: history and patents" page,added 17 Hell patents (general, centrifugal governor, Blattschreiber), and 3 Lorenz Co. patents; added Berlin phonebook entries for Rudolf Hell; expanded info on press agencies. On the "Homebuilt Hell-printers" page, added home built printer of Jan Smeets, ex-ON4ASZ/EA3DPB, and Dale, VK1/VK2DSH.

23-Mar-2010: on the "Electronic circuitry and schematics" page, added info about Kabi and OSRAM components, expanded Sirutor info. On the "Articles, literature, documentation" page, added 1 Spanish article.

21-Mar-2010: on the "Sounds from Hell" page, added sound of Thomson audio output. On the "Hellschreibers from other manufacturers" page, expanded Thomson section.

6-March-2010: on the "Photos" page, added photos of inside of Feld-Hell electronics box). On the "3D photos" page, added 3Ds of inside of Feld-Hell electronics box; click on any 3D photo now shows full size image). On the "Sounds from Hell" page, added audio recoding of Hell-80 transmissions. On the "Hell 72b/c "GL" and Hell 73 "AGL"" page, added click on any 3D image to get full-size/high-resolution image. On the "Hell-80" page, added click on any 3D image to get full-size/high-resolution image; added link to recording of real Hell-80 transmission. On the "Other Siemens Hellschreibers" page, started sections for Blattschreiber and HE-5/HE-6; expanded info on TFK Presse Hell radios; added Hell patent for optical scan of perforated paper tape on which text is typed with special typewriter.

3-March 2010: expanded company history of Jahre and Jaroslaw's, updated schematic.

1-March 2010: on the "Photos" page, added photo of original connector of audio patch cable.. On the "Paper tape, ink, felt ink rollers" page, (added photos of original Feld-Hell ink bottle, accessories box)

27-Feb-2010: on the "Articles, literature, documentation" page, added T empf 39 "L" description. On the "Other Siemens Hellschreibers" page, added T empf 39d, T empf 44c/e, and T send 62a.

15-Feb-2010: on the "Hellschreibers from other manufaturers" page, added section on Thomson solid state Feld-Hell compatible machine. Added 2 literature refs for L.M.T.

12-Feb-2010: on the "Rudolf Hell: history and patents" page,added ref 31-33. On the "Photos" page, added photo of Hell Morseschreiber with document reference. On the "Articles, literature, documentation" page, added several German and English documents. On the "Hell 72b/c "GL" and Hell 73 "AGL"" page, added ref .12. On the "Hellschreiber radio receivers" page, moved this section here, from "Other Siemens Hellschreibers" page. On the "Links" page, added Enigma ref.

31-Jan-2010: on the "Articles, literature, documentation" page, added 1 English, 5 Norwegian, 13 Dutch, and 3 Polish documents.

28-Jan-2010: on the "Hellschreiber software" page, added info and link for PTT interface via USB.

19-Jan-2010: on the "Rudolf Hell: history and patents" page, added reference 30 (1942) and image from that ref.

17 Jan 2010: on the "Hell 72b/c "GL" and Hell 73 "AGL"" page, added ref 9-11.

7-Jan-2010: on the "Hellschreibers from other manufaturers" page, added 2 literature refs. in RC-58-B section.

4-Jan-2010: on the "Hell-80" page, added printout of Hell-80 signals on Feld-Hell.

3 Jan 2010: on the "Hell 72b/c "GL" and Hell 73 "AGL"" page, added ref. 8.

1-Jan-2010: on the "Other Siemens Hellschreibers" page, added schematic Telefunken Presse-Hell receiver E 11.

29-Dec-2009: on the "Presentations" page, updated the draft presentation. On the "Articles, literature, documentation" page, added 3 German and 2 Icelandic documents. On the "Hellschreibers from other manufaturers" page, added documents and info about FACIT printers.

28 Dec 2009: on the "Maintenance" page, added link to ball bearing video.

27-Dec-2009: on the "Hell-80" page, added & replaced photos, added 3D photos, articles.

18-Dec-2009: on the "Hell-80" page, added article, manuals and schematics, character-set printout. On the "Hellschreiber software" page, added link to audio spectrum plots on the "Modern Software modes" page; added pix of new PC-interface.

17-Dec-2009: on the "Rudolf Hell: history and patents" page, added several references. On the "How it works" page, added references for start-stop sync, added photo of slip-contacts, added text about character-drum manufacturing, added text about turning direction of the spindle-thread and of the spindle shaft, add comparison to RTTY speed. On the "Electronic circuitry and schematics" page, added articles about components, added diode price, added intermediate schematic, added 900 Hz signal levels at input/output ports per ref. 13. On the "3D photos" page, added 3D of Feld-Hell character drum by itself. On the "Interfaces to a transceiver" page, updated slip-contact current & voltage limits. On the "Articles, literature, documentation" page, added over 50 German, English, and French documents. On the "Hell 72b/c "GL" and Hell 73 "AGL"" page, added manuals and schematics. On the "Other Siemens Hellschreibers" page, added ref. 3, expanded T empf 14 text, added ZETFAX references. On the "Hellschreibers from other manufacturers" page, added article about LMT 7-tone machine, manual for RC-58-B and BC908 article. On the "Hell software & PC interfacing" page, added audio frequency spectrum plot for various modes. Expanded the "Paper tape, ink, felt ink rollers" with ink, ink rollers.

12-Dec-2009: on the "Hellschreiber software" page, added document about PC-interface by DF5FJ.

7-Dec-2009: on the "Frequencies, contests, nets, museums, balloon beacons" page, updated start time of Sunday Hell Net on 80 m

28 Nov 2009:on the "Electronic circuitry and schematics" page, corrected internal wiring diagram: added pause-character key contact.

26-Nov-2009: on the "Hellschreiber software" page, added description of WinHell software.

19 Nov 2009: on the "Electronic circuitry and schematics" page, added JAHRE advert and ref. 9.

18-Nov-2009: on the "Other Siemens Hellschreibers" page, expanded T empf 14 text. On the "Hellschreibers from other manufaturers" page, added photos of NVA Hellschreiber, incl. 3D, and BC-918-B diagrams.

18-Nov-2009: on the "Frequencies, contests, nets, museums, balloon beacons" page, added photo of the 2009 Annual Hell Meeting.

17-Dec-2009: on the "Homebuilt Hell-printers" page, added articles and photo captions for other home-builts.

7-Nov-2009: on the "Homebuilt Hell-printers" page, added photos of other home-builts.

4-Nov-2009: on the "How it works" page, added pictures of re-inking device.

3 November 2009: on the "Other Hellschreiber models" page, added equipment table.

31-Oct-2009: on the "Rudolf Hell: history and patents" page, added 2 articles (16 & 27) and Meyer image. On the "Articles, literature, documentation" page, added 9 German documents; reorganized the listing. On the "Other Siemens Hellschreibers" page, added info on Presse-Hell receivers, added refs and images of Bernhardine/Fug120. On the "Hellschreiber software" page, added articles in German on Commodore and Fldigi.

20-Oct-2009: on the "Photos" page, added perspective photos of drive shafts. On the "Hellschreibers from other manufaturers" page, added TTK/Sony machine.

19-Oct-2009: on the "3D photos" page, added 3D's of gear-train.

10-Oct-2009: on the "Hellschreibers from other manufaturers" page, added BC908/918 and LMT section.

1-Oct-2009: on the "Rudolf Hell: history and patents" page,added reference to Sony.

22-Sept-2009: on the "Photos" page, added dimensional drawing of the Tornister (carrying case). On the "Other Siemens Hellschreibers" page, added T empf 14 picture.

18-Sept-2009: on the "Articles, literature, documentation" page, added 20 documents, incl. 5 Spanish. On the "Hell-80" page, 1 literature ref added.

28 July 2009: started the "Hell 72b/c "GL" and Hell 73 "AGL"" page.

14-June-2010: on the "Frequencies, contests, nets, museums, balloon beacons" page, added info about Hell-80 net on 40 m.

May-2008: created the world's first Hellschreiber Web-cam.