Title:
Indicating circuit
Document Type and Number:
United States Patent 2183389
Inventors:
Bjornson, Bjorn G.
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Publication Date:
12/12/1939
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Referenced by:
Export Citation:
Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
Other Classes:
379/406.160, 381/104, 455/2.010
International Classes:
H04B3/20