Winged earplug

Details Winged earplug Winged earplug

1990-12-11

1992-09-29

Zarfas, Louis S.

Medical and laboratory equipment

Prophylactic article

Ear plug or nose clip

Patent

active

D03298973

REFERENCES:
patent: D89947 (1933-05-01), Cohn
patent: 2246737 (1941-06-01), Knudsen
patent: 4384575 (1983-05-01), Asker
patent: 4774938 (1988-10-01), Leight

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