Invention Grant
- Patent Title: Telephone system
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Application No.: US13210526Application Date: 1926-08-28
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Publication No.: US1738302APublication Date: 1929-12-03
- Inventor: KRECEK JOSEPH A
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Nokia Bell Labs
- Current Assignee: Nokia Bell Labs
- Priority: US13210526 1926-08-28
- Main IPC: H04M3/40
- IPC: H04M3/40
Information query
