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A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
A62B18/04—Gas helmets
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FR321963D1902-04-241902-04-24Dispositif pour la respiration d'air frais pour des personnes se trouvant dans des lieux fermés
ExpiredFR321963A
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