Electrical transmission system
United States Patent 2424998
US Patent References:
Cryptographic apparatus
- - 2139676


Inventors:
Harry, Nyquist
Publication Date:
08/05/1947
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
380/27
Other Classes:
380/28, 340/14.200
International Classes:
H04L9/38