Title:
Telephone system
Document Type and Number:
United States Patent 2410520
Inventors:
Ellis, Ostline John
Plaque It!
Sponsored by: Flash of Genius |
Publication Date:
11/05/1946
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Referenced by:
Export Citation:
Assignee:
Automatic, Elect Lab
Primary Class:
Other Classes:
379/338
International Classes:
H04M1/31; H04M15/36; H04M1/26