Microphone apparatus
United States Patent 2198424

Inventors:
Benjamin, Baumzweiger
Publication Date:
04/23/1940
View Patent Images:
Download PDF 2198424 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
Shure S. N.
Primary Class:
381/114
Other Classes:
381/173, 381/356
International Classes:
H04R1/40; H04R3/00