Respiratory protection mask

Details Respiratory protection mask Respiratory protection mask

1991-06-06

1993-10-12

Word, A. Hugo

Equipment for safety, protection, and rescue

Fire extinguisher or casing therefor

Portable or hand held

D24164, D29 8

Patent

active

D03403173

REFERENCES:
patent: D224277 (1972-07-01), Venaleck
patent: D277520 (1985-02-01), Gregory
patent: 2227667 (1941-01-01), Panettiere
patent: 2237305 (1941-04-01), Heimann
patent: 2362382 (1944-11-01), Lehmberg
patent: 4520509 (1985-06-01), Ward
patent: 4579113 (1986-04-01), McCreadie et al.
patent: 4671271 (1987-06-01), Bishop et al.
patent: 4941467 (1990-07-01), Takata

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