He was also one of the few people to qualify for the now-obsolete aircraft radiotelegraph endorsement on the latter license.
22.
Guderian's 1914 service with radiotelegraphs in support of cavalry units led him to insist on a radio in every armoured vehicle.
23.
These international Amateur contacts helped prompt the first International Radiotelegraph Conference, held in Washington, DC, USA in 1927-28.
24.
From 1921 to 1923 Dreher worked as an operating engineer at RCA's transatlantic radiotelegraph station located at Riverhead, Long Island.
25.
One of the earliest applications of radiotelegraph operation, long predating broadcast radio, were marine radio stations installed aboard ships at sea.
26.
Fire directions came in from the fortress by telephone to Dutch Navy Command in Den Helder who forwarded them by radiotelegraph to the gunboat.
27.
He also invented a mechanical device, the Goldschmidt tone wheel, used in early radio receivers to receive the new continuous wave radiotelegraph signals.
28.
Even in his high school days, Weitbrecht was interested in amateur radio and used radiotelegraph to communicate with fellow radio operators around the country.
29.
A radiotelegraph " duplex channels " which have fully equipped stations on both ends and are capable of sending information in both directions.
30.
The classes were conducted by the Room 2426 crew, and the radiotelegraph operators became known as the " On-The-Roof Gang ".
