Ear insert for earphones
United States Patent 2487038
US Patent References:
Audiphone
- - 1753817

Small receiver
- - 2078385

Ear stopper
- - 2246737

Earphone
- - 2325590

Hearing aid earpiece
- - 2430229


Inventors:
Jasper, Baum
Publication Date:
11/08/1949
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Assignee:
SONOTONE CORP
Primary Class:
181/135
Other Classes:
D24/106, 128/867, 381/380
International Classes:
H04R25/00
Foreign References:
FR396868A