Title:
Telephone-exchange system
Document Type and Number:
United States Patent 1340940


Inventors:
Dixon, Amos F.
Reeves, Frank N.
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Sponsored by:
Flash of Genius
Publication Date:
05/25/1920
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Assignee:
WESTERN ELECTRIC CO
Primary Class:
379/288
Other Classes:
379/271
International Classes:
H04Q3/42