Shield for face mask

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

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Patent

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D03070654

REFERENCES:
patent: D199931 (1964-12-01), Kline
patent: D287300 (1986-12-01), Lonnstedt
patent: 2755476 (1956-07-01), Bowers, Sr.
patent: 2829374 (1958-04-01), Malcom, Jr.

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