Title:
Sound recording and sound reproducing and locating apparatus
United States Patent 2126370
Inventors:
Doolittle, Franklin M.
Publication Date:
08/09/1938
Export Citation:
Click for automatic bibliography generation
Assignee:
RCA CORP
Primary Class:
369/91
Other Classes:
369/92
International Classes:
H04R5/00; H04S1/00
View Patent Images:
Download PDF 2126370        PDF help