The provisions of 30 CFR 77.1901-1 (relating to methane and oxygen deficiency tests; approved devices) are incorporated by reference.
25 Pa. Code § 208.394
The provisions of this §208.394 issued under sections 106 and 106.1 of the Bituminous Coal Mine Safety Act (52 P.S. §§ 690-106 and 690-106.1).