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  293.120.  Air safety requirements. — Air in which men work or travel in mines shall be improved when:

  (1)  It contains less than nineteen and five-tenths percent oxygen;

  (2)  It contains more than one-hundredth percent carbon monoxide;

  (3)  It contains more than five-tenths percent carbon dioxide;

  (4)  It contains more than one percent methane; or

  (5)  Is contaminated with dust or with noxious or poisonous gases in excess of accepted limits as established by the director of the division of mine inspection.


(L. 1959 S.B. 188 § 13)

---- end of effective   28 Aug 1959 ----

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