Four-way T-shaped respiratory valve

Details Four-way T-shaped respiratory valve Four-way T-shaped respiratory valve

1987-03-16

1989-03-14

Burke, Wallace R.

Equipment for safety, protection, and rescue

Fire extinguisher or casing therefor

Portable or hand held

Patent

active

D03002705

REFERENCES:
patent: D233372 (1974-10-01), Havstad
patent: 3643686 (1972-02-01), Koegel
patent: 4098290 (1978-07-01), Glenn
patent: 4180066 (1979-12-01), Milliken et al.
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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