Phonographic apparatus
United States Patent 2113401
Inventors:
Goldsmith, Alfred N.
Publication Date:
04/05/1938
View Patent Images:
Export Citation:
Assignee:
RCA CORP
Primary Class:
Other Classes:
369/239, 369/282, 369/251, 369/270.100, 369/267, 369/171, 369/140, 369/174
International Classes:
G11B3/08; G11B17/02; G11B3/00