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Device for forming grooves in sound-records
United States Patent 1342872
Inventors:
Sandell, Henry K.
Publication Date:
06/08/1920
View Patent Images:
Download PDF 1342872
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Assignee:
Mills H. S.
Primary Class:
33/27.030
Other Classes:
369/278
International Classes:
G11B3/70
;
G11B3/00