Chief Signal Corp officer tests a new high
June 27, 1938 - Chief Signal Corp officer tests a new high powered public address system, Washington D.C. The new sound unit is designed to provide a mobile sounds system which will afford a maximum of reliability, ease of operation, fidelity of reproduction, and sound area coverage
Picture No
12273243
Media ID
48448510
Size
4691px x 3840px
(4.4MB)
Credit
© Stocktrek Images / Mary Evans
Source
Stocktrek Images
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1930 1939 Address Announcement Checking Inspecting Message Operating Speaker Transmitting
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