Center distance 1.75m, support strength 1.63~1.71MPa; suitable for coal seams with thickness of 8.6~17.2m; continuous use for 7 years without major overhaul and lifting to the surface.
Center distance 1.75m, support strength 1.63~1.71MPa; suitable for coal seams with thickness of 8.6~17.2m; continuous use for 7 years without major overhaul and lifting to the surface.