Signaling system
United States Patent 2302081

Inventors:
Otto, Weitmann
Publication Date:
11/17/1942
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Assignee:
IBM
Primary Class:
178/17D
Other Classes:
400/73, 28/227, 310/323.010, 340/825.220, 310/328, 315/168, 235/446, 235/61PM, 310/319
International Classes:
G06K7/04; H04L17/12; H04L17/00