Invention Grant
- Patent Title: Magnetic sound powered telephone
- Patent Title (中): 磁力电话机
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Application No.: US29784352Application Date: 1952-07-09
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Publication No.: US2692918APublication Date: 1954-10-26
- Inventor: BERGER SAMUEL I
- Applicant: BERGER SAMUEL I
- Assignee: Samuel I Berger
- Current Assignee: Samuel I Berger
- Priority: US29784352 1952-07-09
- Main IPC: H04R11/00
- IPC: H04R11/00
Public/Granted literature
- USD949605S1 File cabinet Public/Granted day:2022-04-26
Information query
