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United States Patent 2180397

Inventors:
Wallace, Carlisle Richard
Publication Date:
11/21/1939
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Assignee:
Wallace, Carlisle Richard
Primary Class:
358/3.020
Other Classes:
358/302, 358/443, 358/3.060, 358/411, 358/3.300, 358/474
International Classes:
H04N1/00; H04N1/23