Invention Grant
- Patent Title: Multiple lane magnetic sound recording system
- Patent Title (中): 多车道磁记录系统
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Application No.: US18635138Application Date: 1938-01-22
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Publication No.: US2275961APublication Date: 1942-03-10
- Inventor: HELLER HERMAN S
- Applicant: HELLER HERMAN S
- Assignee: Herman S Heller
- Current Assignee: Herman S Heller
- Priority: US18635138 1938-01-22
- Main IPC: G11B5/49
- IPC: G11B5/49 ; G11B15/12
Information query
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