Art of duplicating phonograph records
United States Patent 2067502

Inventors:
Pollard, Charles E.
Russell, Alexander G.
Publication Date:
01/12/1937
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
205/68
Other Classes:
369/286, 369/283, 369/288, 425/810
International Classes:
G11B3/70; G11B3/00