Dual filter respirator

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

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D02862131

REFERENCES:
patent: D271246 (1983-11-01), Matheson et al.
patent: 2664887 (1954-01-01), Green
patent: 4373520 (1983-02-01), Arbiqne
New Equipment Digest (vol. 48, No. 2, Feb. 1983) Scientific Library Call No. TA/401/.N45 (p. 88: Lightweight Respirator).

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