Earplug

Details Earplug Earplug

1990-09-21

1992-11-03

Zarfas, Louis S.

Medical and laboratory equipment

Prophylactic article

Ear plug or nose clip

Patent

active

D03307611

REFERENCES:
patent: D298356 (1988-11-01), Falco
patent: 2246737 (1941-06-01), Knudsen
patent: 2487038 (1949-11-01), Baum
patent: 4314553 (1982-02-01), Westerdal
patent: 4867149 (1989-09-01), Falco

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