Phonograph record and method of producing the same
United States Patent 1513120

Inventors:
Madsen, Charles P.
Publication Date:
10/28/1924
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Assignee:
MADSENELL CORP
Primary Class:
428/637
Other Classes:
428/671, 205/171, 428/935, 205/181, 205/68, 205/255, 29/DIG.028, 428/680, 369/283, 204/281, 205/271
International Classes:
G11B3/70; G11B3/00