Title:
System of communication
Document Type and Number:
United States Patent 1465732
Inventors:
Heising, Raymond A.
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Publication Date:
08/21/1923
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Referenced by:
Export Citation:
Assignee:
WESTERN ELECTRIC CO
Primary Class:
Other Classes:
379/338, 360/8, 455/403, 178/89
International Classes:
H04L25/05; H04L25/02