Columbia Broadcasting Systems scanning room showing the 30 amp. arc with the scanning disc on the front end which scans the image in the adjacent studio, from which the reflected light is picked up by the photo-electric cell and converted into electrical energy. New York, New York: July, 1931.
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Creative#:
TOP29656521
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
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N/A
Property Release:
N/A
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No
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