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#1502
1973 15c Progress in Audio & Visual Electronics
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U.S. #1502
15¢ Microphone and Speaker
Electronics Progress Issue
Electronics Progress Issue
Issue Date: July 10, 1973
City: New York, NY
Quantity: 39,005,000
Printed By: Bu... more
U.S. #1502
15¢ Microphone and Speaker
Electronics Progress Issue
Electronics Progress Issue
Issue Date: July 10, 1973
City: New York, NY
Quantity: 39,005,000
Printed By: Bureau of Engraving and Printing
Printing Method: Lithographed, engraved
Perforations: 11
Color: Gray green and multicolored
Celebrates the progress made with component parts in the electronics field. Emile Berliner invented the microphone; Thomas Edison, the vacuum tube; and Vladimir Zworykin, the photoelectric cell, which brought television to life in 1928.
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