Pennsylvania Statutes Title 52 P.S. Mines and Mining § 70-715. Main link chain connecting rope to cage to be of best quality of iron; bridle chains to be of same quality of iron and attached to main link rope or rope socket when persons are being lowered

The main link of the chain connecting the rope to the cage, gun-boat or car in any shaft or slope, shall be made of the best quality of iron. Bridle chains made of the same quality of iron shall be attached to the main link, rope or rope socket from the crosshead of the cage, gun-boat or car when persons are being lowered or hoisted thereon.