Nasal mask

Details Nasal mask Nasal mask

1991-12-02

1993-02-02

Chin, Kay H.

Equipment for safety, protection, and rescue

Fire extinguisher or casing therefor

Portable or hand held

D29 7

Patent

active

D03330150

REFERENCES:
patent: 2858828 (1958-11-01), Matheson
patent: 4573463 (1986-03-01), Hall
patent: 4601287 (1986-07-01), Royce, Jr.
patent: 4637387 (1987-01-01), Hall
patent: 5143061 (1992-09-01), Kaimer
Drawing (FIGS. 1-6) of a prior art mask of Mr. Andrew Mitchell (circa 1990).

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