It shall be unlawful to use or to order or permit the use of any diesel engine in any lead, zinc or other metal mine in this state at any time which is not equipped with detoxification equipment and other safety devices meeting the standards set forth in the rules and recommendations promulgated by the U.S. Bureau of Mines, or when such detoxification equipment and other safety devices on the engine is defective, or not in perfect working order. Laws 1947, p. 303, § 2.
Oklahoma Legal Code