Pennsylvania Statutes Title 52 P.S. Mines and Mining § 70-304. Extensions placed on inspector's map every two months

The said operator or superintendent shall as often as once in every two months place or cause to be placed on the said inspector's map or plan of said coal mine or colliery, the plan of the extensions made in such coal mine or colliery during the preceding two months. The said extensions shall be placed on the inspector's map and the map returned to the inspector within one month from the date of the last survey.