Dust respirator

Details Dust respirator Dust respirator

1979-09-10

1981-07-07

Ansher, Bernard

Equipment for safety, protection, and rescue

Fire extinguisher or casing therefor

Portable or hand held

D 2234, D2902, D249

Patent

active

D02598175

REFERENCES:
patent: Re28102 (1974-08-01), Mayhew
patent: D235687 (1975-07-01), Bragg
patent: D249072 (1978-08-01), Revoir
patent: 2751905 (1956-06-01), Creelman
patent: 3971369 (1976-07-01), Aspelin et al.

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