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  2. Zimmermann telegram - Wikipedia

    en.wikipedia.org/wiki/Zimmermann_Telegram

    Zimmermann's office sent the telegram to the German embassy in the United States for retransmission to Von Eckardt in Mexico. It has traditionally been understood that the telegram was sent over three routes. It went by radio, and passed via telegraph cable inside messages sent by diplomats of two neutral countries (the United States and Sweden).

  3. V-mail - Wikipedia

    en.wikipedia.org/wiki/V-mail

    V-mail letter written July 1943 V-mail envelope with V-mail symbol, March 1943. V-mail correspondence was on small letter sheets, 17.8 by 23.2 cm (7 by 9 + 1 ⁄ 8 in), that would go through mail censors before being photographed and transported as thumbnail-sized image in negative microfilm. Upon arrival to their destination, the negatives ...

  4. United States airmail service - Wikipedia

    en.wikipedia.org/wiki/United_States_airmail_service

    The first official experiment at flying air mail to be made under the aegis of the United States Post Office Department took place on September 23, 1911, on the first day of an International Air Meet sponsored by The Nassau Aviation Corporation of Long Island, when pilot Earle L. Ovington flew 640 letters and 1,280 postcards from the Aero Club of New York's airfield located on Nassau Boulevard ...

  5. Mother's boxes held letters home from U.S. Navy seaman on ...

    www.aol.com/mothers-boxes-held-letters-home...

    A half-dozen letters home from war, written by Savannahian Jack O'Donnell, survive among writer's mother's keepsakes.

  6. French letters confiscated by Britain’s Royal Navy are opened ...

    www.aol.com/french-letters-confiscated-britain...

    The notes, written in 1757-8, were intended for the crew of French warship the Galatee and sent by wives, fiances, parents and siblings. French letters confiscated by Britain’s Royal Navy are ...

  7. Letters from war: WWII sailor's missives home told different ...

    www.aol.com/letters-war-wwii-sailors-missives...

    Jana, now 60, has spent the past two years transcribing her father's journal, photo albums, and more than 300 letters sent home during his tours of duty abroad. There's great value in what Jana ...

  8. Air-to-ground communication - Wikipedia

    en.wikipedia.org/wiki/Air-to-ground_communication

    When the circuit was completed it sent out a signal as a dot or a dash. By depressing the plunger devise in a rhythmic pattern a telegraph operator could spell out words, with each dot-dash sequence representing a corresponding letter in a word. Using this technology planes were able to call in accurate artillery fire and act as forward ...

  9. Postal censorship - Wikipedia

    en.wikipedia.org/wiki/Postal_censorship

    Part of message obliterated by indelible pencil. Postal censorship is the inspection or examination of mail, most often by governments.It can include opening, reading and total or selective obliteration of letters and their contents, as well as covers, postcards, parcels and other postal packets.