Invention Grant
- Patent Title: Phonographic apparatus
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Application No.: US70460533Application Date: 1933-12-30
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Publication No.: US2093550APublication Date: 1937-09-21
- Inventor: COOK ELLSWORTH D
- Applicant: RCA CORP
- Assignee: RCA Corp
- Current Assignee: RCA Corp
- Priority: US70460533 1933-12-30
- Main IPC: G11B3/64
- IPC: G11B3/64
Information query
IPC分类:
