Communication system employing pulse code modulation
United States Patent 2437707
US Patent References:
Secret communication system
- - 2199634


Inventors:
Pierce, John R.
Publication Date:
03/16/1948
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
375/242
Other Classes:
331/75, 327/1, 331/129, 327/91
International Classes:
H04B14/04