Two way check respiratory valve

Details Two way check respiratory valve Two way check respiratory valve

1987-08-06

1989-12-19

Burke, Wallace R.

Equipment for safety, protection, and rescue

Fire extinguisher or casing therefor

Portable or hand held

Patent

active

D03051650

REFERENCES:
patent: D276464 (1984-11-01), Weigl et al.
patent: D276465 (1984-11-01), Clawson et al.
patent: D300270 (1989-03-01), Rudolph et al.
patent: D300271 (1989-03-01), Rudloph et al.
patent: D300272 (1989-03-01), Rudolph et al.
patent: D300273 (1989-03-01), Rudolph et al.
patent: D300274 (1989-03-01), Rudolph et al.
patent: 3643686 (1972-02-01), Koegel
patent: 4436090 (1984-03-01), Darling
patent: 4489721 (1984-12-01), Ozaki et al.
patent: 4493339 (1985-01-01), Porter, Jr.

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