Poste de Radio- Téléphonie de haute qualité

This is a bit of a work in progress. You'll have to forgive the off center scan. The pages are 12.25" x 9.5" which is too large for my scanner. I'll take it to Kinkos at some point for the full page scans.  It's now scanned and posted [HERE]

The phase "Poste de Radiotéléphonie de haute qualité" translates to "High quality radiotelephone station" according to Google. The next phrase "ondes courtes comprises entre 20 méters et 100 méters" translates to "short waves between 20 meters and 100 meters".  This is a schematic for a shortwave transmitter. 

Possibly more interesting than that is the thick orange penciled text in the upper right hand corner. It reads F8DR. This is too short to be an American amateur radio call sign. American ham callsigns have a known format (at least they do now) It should start with a two letter prefix, then a region number, then a three letter suffix. Like below:

from hamradioprep.com

French call signs don't work the same way. But they do have their own set of prefixes: FAA-FZZ. But there a numeric set as well: FA1, and FB1 for VHF, F1, and F4 for frequencies above 30 MHz and then a set for all Ham frequencies (HF , VHF, UHF) those started F2, F3, F5, F6, F8 and F9. The 2 digit sufficx numbers are older, 3 is the modern standard. A quick check of the 2020 and 2025 French Radioamateurs site did not include an F8DR, but it did include some 4 character calls. [SOURCE]  

But a general search turned it up Radex magazine includes a log of hams Julius Orosz logged in 1937 which includes F8DR. [SOURCE] The article gives Orosz's address as 12205 Parkhill Ave., Cleveland, OH. Radio magazine of October 1934 also includes the call sign in a set heard by W1CNU in Stamford, CT; specifying "F's Heard on Fone and CW."  I know hams are big on abbreviation but "F' just means French; being part of the French prefixes. CW means continuous waves (morse code). [SOURCE] Back in 1936 Page Taylro writes in Radex mentioning F8DR.

"A word to those who have yet to hear a foreign ham: tune just outside either end of the band. Amateurs in other countries are not so severely restricted as the Americans and they usually work very close to the  outside limits. Some of the most consistent stations are F8DR, HB9AQ, EA4AO, G5NI, and many South Americans and Mexicans. Altogether I have heard 33 countries. The best time for Europeans is 5-7 pm. EST, and for the Australians is from midnight to 1 am. The best Aussies are VK2EP, 2BQ and 3KX. My receiver is a 4 -tube home-made set."

Radio Craft of  December 1935 also lists F8DR. The editor, Robert Base, does not specify where he's listening from more specifically than Baltimore, MD but places F8DR in Paris Dial 96, at 4:03 PM. [SOURCE]  But it's in a 1939 issue of the Radio Amateur Call Book " F8DR  — Societe  d’Entreprises  Electro-Techniques,  53  rue du  General-Foy,  Paris  8e.  With that address I found an earlier listing in 1938. [SOURCE]  Oddly rue du  General-Foy only numbers up to 50 today, it ends in a T intersection at Rue de Monceau. 

This of course now matches the address on the schematic.  But the name Societe  d’Entreprises  Electro-Techniques appears once more. This time with the more accurate address 35, Rue du General Foy, Paris. (below)  It was in Mining Magazine of Salsibury House London. [SOURCE] It's a "Trade Paragraph " on page 369;  "Societe d’Entreprises Electro-Techniques, of 35, Rue du General Foy, Paris, issue a booklet printed in French and English describing their apparatus for electrical prospecting."

Eventually I found a 1948 IRE directory which at last listed a name.  "DE BOZAS, GUY D. (A’46), Manager. Ste. Nouvelle D’Entreprises Electro-Techniques, 35 Rue du General Foy a Paris. Mail: 41

Boulevard Lannes, Paris (16e), France"  the company name is slightly different, but Guy De Bozas is probably our man. [LINK] The oldest directory he appears in is the 1928, still with Electro-Techniques .  He's also in the 1937 directory with a slightly different surname DE BOZAS, GUY DU BOURG (A'19), De Lasko d'Entreprises, Electro-Techniques, Paris, France. For mail: 35 Rue du General Foy, Paris,France. It's certainly him. A genealogy website lists him as born June 30th, 1895. He died august 4th 1985 at Neuilly-sur-Seine. I suspect that's him because the IRE admission date of 1919 is more plausible if he were 24 years old at the time. In the 1963 IRE directory he is still listed but without the company name. 

But the best listing for Guy De Bozas is from 1926 in the Catalog general Librairie Francaise. It lists him as "ingenieur. - etude provisoire sur le fluide d'un medium a effets physiques. Etampes, impr, Terrier, 1921 in-8 20p."  that translates to "engineer. - provisional study on the fluid of a medium with physical effects." In searching for him purely as an engineer I eventually found a patent no. 1656262 "Wireless apparatus for determining angles or direction." That led to an article in La Science et la vie from 1929 about his patent. It had been incorporated in flight navigation via radio beacon. [SOURCE] The last time I can find him published is in L'Onde électrique in 1972. Here he is also listed as the President and Director general of IEG. He would have been 77 years old at the time.