Signal
United States Patent 1758546

Inventors:
Karl, Wartmann
Publication Date:
05/13/1930
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Assignee:
Karl, Wartmann
Primary Class:
340/541
Other Classes:
5/940, 340/666, 200/520, 200/85R, 5/658, 968/581, 5/905
International Classes:
G04C21/02; H01H35/00; G04C21/00