Title:
Signaling system
Document Type and Number:
United States Patent 2232866

Inventors:
Pruden, Harold M.
Publication Date:
02/25/1941
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
361/184
Other Classes:
340/825.740, 340/825.620
International Classes:
H04Q1/45; H04Q1/30




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