Invention Grant
- Patent Title: Electrical recording
- Patent Title (中): 电气录音
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Application No.: US32169128Application Date: 1928-11-24
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Publication No.: US1961372APublication Date: 1934-06-05
- Inventor: MARRISON WARREN A
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Nokia Bell Labs
- Current Assignee: Nokia Bell Labs
- Priority: US32169128 1928-11-24
- Main IPC: G01R13/06
- IPC: G01R13/06
Information query
