Title:
Ear canal insert
Document Type and Number:
United States Patent 3080011

Inventors:
Henderson, John D.
Publication Date:
03/05/1963
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Assignee:
Henderson, John D.
Primary Class:
181/135
International Classes:
H04R25/00
US Patent References:
1581700Ear-supported telephone receiver
1755775Earpiece
2430229Hearing aid earpiece
2458884Ear protector valve
2487038Ear insert for earphones
2521414Adjustable auditory insert
2619960Aural protective device
2738850Artificial hearing aid
2888921Ear inserts
2939923Hearing aid plastic ear pieces


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