Respiratory protection

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      <subfield code="a">Respiratory protection come in various types: air-purifying, air-supplied, air-filtering, for toxic atmospheres, for lack of oxygen, etc. The safety professional must know what types are available and what is required for each separate situation, because this is crucial to the employees'life and health</subfield>
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      <subfield code="g">Vol, 116, nº 4, October 1977 ; p. 49-54</subfield>
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