Title:
Phonograph record blank
United States Patent 2216970
Inventors:
Walker, William T.
Publication Date:
10/08/1940
Export Citation:
Click for automatic bibliography generation
Assignee:
RCA CORP
Primary Class:
106/37
Other Classes:
106/272, 361/220, 369/73, 369/288
International Classes:
G11B3/70
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