Four way respiratory valve with dual balloon

Equipment for safety – protection – and rescue – Fire extinguisher or casing therefor – Portable or hand held

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D03002730

REFERENCES:
patent: D233372 (1974-10-01), Haustad
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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