Patent classifications
A
HUMAN NECESSITIES
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A62
LIFE-SAVING; FIRE-FIGHTING
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A62B
DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
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18/00
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
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A62B18/003
having means for creating a fresh air curtain
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