Ear canal insert
United States Patent 3080011
US Patent References:
Ear-supported telephone receiver
- - 1581700

Earpiece
- - 1755775

Hearing aid earpiece
- - 2430229

Ear protector valve
- - 2458884

Ear insert for earphones
- - 2487038


Inventors:
Henderson, John D.
Publication Date:
03/05/1963
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Assignee:
Henderson, John D.
Primary Class:
181/135
Other Classes:
381/381, 128/868
International Classes:
H04R25/00
US Patent References:
2521414Adjustable auditory insert
2619960Aural protective device
2738850Artificial hearing aid
2888921Ear inserts
2939923Hearing aid plastic ear pieces