30 C.F.R. § 7.21 Purpose and effective date.
Title 30 - Mineral Resources
This subpart establishes the specific requirements for approval of brattice cloth and ventilation tubing. It is effective August 22, 1988. Applications for approval or extension of approval submitted after August 22, 1989, shall meet the requirements of this part.
Title 30: Mineral Resources
PART 7—TESTING BY APPLICANT OR THIRD PARTY
Subpart B—Brattice Cloth and Ventilation Tubing
§ 7.21 Purpose and effective date.
