Invention Grant
- Patent Title: Signaling system
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Application No.: US18585238Application Date: 1938-01-20
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Publication No.: US2180334APublication Date: 1939-11-21
- Inventor: BREDEHOFT HAROLD A
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Nokia Bell Labs
- Current Assignee: Nokia Bell Labs
- Priority: US18585238 1938-01-20
- Main IPC: H04Q1/442
- IPC: H04Q1/442
Information query
