Title:
Device for forming grooves in sound-records
United States Patent 1342872
Inventors:
Sandell, Henry K.
Publication Date:
06/08/1920
Export Citation:
Click for automatic bibliography generation
Assignee:
Mills H. S.
Primary Class:
33/27.03
Other Classes:
369/278
International Classes:
G11B3/70
View Patent Images:
Download PDF 1342872        PDF help