Communication system
United States Patent 2048081

Inventors:
Riggs, Alger S.
Publication Date:
07/21/1936
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Assignee:
Riggs, Alger S.
Primary Class:
370/534
Other Classes:
340/870.140, 370/535, 375/364, 370/537
International Classes:
H04J3/04; H04J3/06