United States Patent 3123069
US Patent References:
Ear-drum protector or ear-stopper
- - 1344935

Ear plug
- - 2824558

Ear inserts
- - 2888921


Publication Date:
03/03/1964
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Primary Class:
128/865
International Classes:
A61F11/08; A61F11/00
Foreign References:
FR1043046A