Invention Grant
- Patent Title: Telephone system
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Application No.: US21435138Application Date: 1938-06-17
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Publication No.: US2201986APublication Date: 1940-05-28
- Inventor: COLLIS RAYMOND E
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Nokia Bell Labs
- Current Assignee: Nokia Bell Labs
- Priority: US21435138 1938-06-17
- Main IPC: H04M3/523
- IPC: H04M3/523 ; H04Q3/00
Information query
