1940 Electro-Voice introduces the noise-cancelling microphone to the military, which revolutionizes tank and aircraft communications. In the aftermath of World War II, the company is awarded a Congressional Citation for this important contribution to the war effort. Mercury 911 Microphone/PU Electro-Voice Inc.; USA, build 1950?, 5 pictures, 3 schematics, United States of America, tubes, semiconductors, Microphone.
Electro Voice Microphone Serial Numbers
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