Noise insulating ring for earphones
United States Patent 2447470
US Patent References:
/0572108.html
- - 0572108

Earpiece for ear phones
- - 1893474

Earpiece
- - 2204183

Headphone
- - 2353070


Inventors:
Valentine, Joseph E.
Publication Date:
08/17/1948
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Assignee:
OXZYN COMPANY
Primary Class:
381/372
Other Classes:
381/370
International Classes:
H04R1/10
Foreign References:
GB260246A
GB274511A
FR636213A
NO42378C1
DE639189C