Invention Grant
- Patent Title: Long distance telephone system
- Patent Title (中): 长途电话系统
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Application No.: US50127530Application Date: 1930-12-10
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Publication No.: US1884697APublication Date: 1932-10-25
- Inventor: HORTON JR ARTHUR W
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Nokia Bell Labs
- Current Assignee: Nokia Bell Labs
- Priority: US50127530 1930-12-10
- Main IPC: H04B3/20
- IPC: H04B3/20
Information query
