Invention Grant
- Patent Title: Tone-modulating device for talking-machines.
- Patent Title (中): 调音机调音装置。
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Application No.: US1914877049Application Date: 1914-12-14
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Publication No.: US1231370APublication Date: 1917-06-26
- Inventor: JOHNSON ELDRIDGE R
- Applicant: VICTOR TALKING MACHINE CO
- Assignee: Victor Talking Machine Co
- Current Assignee: Victor Talking Machine Co
- Priority: US1914877049 1914-12-14
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