Title:
Phonograph disk
Document Type and Number:
United States Patent 2283797
Inventors:
Dech, Raymond S.
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Sponsored by: Flash of Genius |
Publication Date:
05/19/1942
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Referenced by:
Export Citation:
Assignee:
AUDIO MFG CORP
Primary Class:
Other Classes:
369/286, 369/288
International Classes:
G11B3/70; G11B23/00; G11B3/00