Title:
Hearing guard and ear protector
United States Patent 2427664
US Patent References:
Ear stopper
- - 2246737

/0302738.html
- - 0302738

/1016877.html
- - 1016877

Ear plug
- - 2053995


Inventors:
Dunbar, James Y.
Knight, John S.
Publication Date:
09/23/1947
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Assignee:
Dunbar, James Y.
Knight, John S.
Primary Class:
128/867
Other Classes:
220/DIG.019
International Classes:
A61F11/08; A61F11/00