Telegraph system
United States Patent 2186899

Inventors:
Humy, Fernand D. E.
Franklin, Lawrence W.
Publication Date:
01/09/1940
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Assignee:
WESTERN UNION TELEGRAPH CO
Primary Class:
379/93.370
Other Classes:
379/442, 178/4.10R, 379/108.020
International Classes:
H04M11/06