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A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
A62B23/00—Filters for breathing-protection purposes
A62B23/02—Filters for breathing-protection purposes for respirators
A62B23/025—Filters for breathing-protection purposes for respirators the filter having substantially the shape of a mask
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FR707658D1930-12-011930-12-01Dispositif préservatif de l'aspiration de poussières, gaz délétères, etc. dans les voies respiratoires
ExpiredFR707658A
(fr)