Respiratory protection

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      <subfield code="a">Respiratory protection</subfield>
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      <subfield code="a">The first line of defense against respiratory hazards is atmospheric analysis and engineering or administrative control. The second is personal protective equipment for toxic atmospheres, particulates, and oxygen deficiency. Respiratory protective devices vary in design, equipment specifications, application, and protective capability. Proper selection depends on the toxic substances involved, conditions of exposure, human capabilities, and equipment fit</subfield>
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      <subfield code="g">Vol. 118, nº 1, July 1978 ; p. 57-62</subfield>
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