How to select respiratory equipment

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      <subfield code="a">Employees' health and safety are often contingent upon a respirator that matches air-borne hazards. This article reports respiratory equipment: mechanical filter respirators, chemical cartridge respirators and gas masks; air-line respirators: hose masks, air-supplied suits; self-contained apparatus; care of devices</subfield>
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      <subfield code="g">Vol, 119, nº 2, February 1979 ; p. 32-41</subfield>
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