Noise attenuating ear protectors
United States Patent 2782423
US Patent References:
Manufacture of sponge-rubber articles
- - 1484731
Ear guard
- - 1683928
Ear protector
- - 2051686
Earphone socket and noise shield
- - 2468721
Foamed alkyd-isocyanate plastics
- - 2577279
Manufacture of sponge-rubber articles
- - 1484731
Ear guard
- - 1683928
Ear protector
- - 2051686
Earphone socket and noise shield
- - 2468721
Foamed alkyd-isocyanate plastics
- - 2577279
Inventors:
Eli, Simon
Thomas, Frank W.
Wiegand, Phillip J.
Thomas, Frank W.
Wiegand, Phillip J.
Publication Date:
02/26/1957
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Export Citation:
Assignee:
LOCKHEED AIRCRAFT CORP
Primary Class:
Other Classes:
2/423, D14/205
International Classes:
A61F11/14; A61F11/00