unknown | Demonstrations

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Authors: unknown
Date: 1939
Type: photographic prints
Identifier: aql:1040
Description: Demonstration inside auditorium at the Glass Incorporated Building. Taken May 6th, 1939.
Authors: unknown
Date: 1939
Type: photographic prints
Identifier: aql:1025
Description: Demonstration of new voice machine called the Vocoder in front of a crowd inside the A.T.&T. Building on April 30th, 1939.
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