Invention Grant
- Patent Title: Commercial phonograph
- Patent Title (中): 商业留声机
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Application No.: US9065436Application Date: 1936-07-15
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Publication No.: US2110092APublication Date: 1938-03-01
- Inventor: NORTON LELAND D , FRYKMAN VICTOR L
- Applicant: DICTAPHONE CORP
- Assignee: Dictaphone Corp
- Current Assignee: Dictaphone Corp
- Priority: US9065436 1936-07-15; US4357635 1935-10-04
- Main IPC: H04R11/08
- IPC: H04R11/08
Information query
