Visor attachment for safety helmets

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

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active

D03198995

REFERENCES:
patent: D168736 (1953-02-01), Cooper et al.
patent: 2798222 (1957-07-01), Evans et al.
patent: 3369255 (1968-02-01), Bolle
patent: 4117553 (1978-10-01), Bay
patent: 4856109 (1989-08-01), Desy et al.

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