416 - Timbering.
§ 416. Timbering. The roofs and sides of each passageway and working place in every mine and tunnel shall be properly timbered and shall be kept secure. No person shall work in an unsafe place except to make it safe.
§ 416. Timbering. The roofs and sides of each passageway and working place in every mine and tunnel shall be properly timbered and shall be kept secure. No person shall work in an unsafe place except to make it safe.