Invention Grant
- Patent Title: Telephone-exchange system
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Application No.: US24727728Application Date: 1928-01-17
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Publication No.: US1738290APublication Date: 1929-12-03
- Inventor: FOWLER CLARENCE B
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Nokia Bell Labs
- Current Assignee: Nokia Bell Labs
- Priority: US24727728 1928-01-17
- Main IPC: H04M15/28
- IPC: H04M15/28
Information query
