Where roof support is required, minimum timbering, or other roof support methods, suitable to the roof conditions of each mine or part of a mine shall be adopted by the operator and complied with.
52 P.S. § 70-269
Where roof support is required, minimum timbering, or other roof support methods, suitable to the roof conditions of each mine or part of a mine shall be adopted by the operator and complied with.
52 P.S. § 70-269