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United States Patent 1587173

Inventors:
Nall, Torney O.
Beauvais, Ernest J.
Publication Date:
06/01/1926
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Assignee:
Nall, Torney O.
Beauvais, Ernest J.
Primary Class:
368/33
Other Classes:
40/521, 968/200, 368/40
International Classes:
G04B19/243; G04B19/00