Signal Corps apparatus for airplane antenna reel (French type) radio apparatus in use during World War I. The photograph was taken in 1919 by an unknown photographer. The image shows a prototype

World war i radio equipment hi-res stock photography and images - Alamy

American radio apparatus hi-res stock photography and images - Page 3 - Alamy

WWII_Radio_Direction_Finders

National Museum of American History

Signal achievements in Army history (photos) - CNET

SIGNAL CORPS ANTENNA - A-62 - PHANTOM - US ARMY - Global War Museum i Munkedal

Telecommunication transmission in war hi-res stock photography and images - Alamy

S.C. airplane radio apparatus in Washington, D.C. The photo was taken on April 17, 1919, by Sergeant McKenzie. It shows the S.C. airplane radio apparatus with a regulating air fan type F-A

File:US Army Signal Corps AN-TRC-1, 5, 6, & 8 microwave relay station 1945.jpg - Wikipedia

Guide to the American Petroleum Institute Photograph and Film Collection, 1860s-1980s

Airplane antenna reel hi-res stock photography and images - Alamy

Image: The photograph shows a French type K transmitter used during World War I. The transmitter is labeled as a Cuplanes-RECO French Tippe K Transmitte AC 50 Watto DC - 55 Watts

Signal corps apparatus hi-res stock photography and images - Page 2 - Alamy

Getting the Message Through-Chapter 4