Signaling system
United States Patent 2450997
US Patent References:
/0673519.html
- - 0673519

One-wire electrical selecting apparatus
- - 1900095

Telephone system
- - 2332448

Signaling circuit
- - 2347777


Inventors:
Shann, Oscar A.
Publication Date:
10/12/1948
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
379/143
Other Classes:
194/214, 361/188, 338/22R
International Classes:
H04M17/02; H04M17/00