A crushing apparatus has a gyratory crusher, which has an inner shell, an outer shell and an eccentric. The crank angle detector outputs a pulse signal corresponding to each tooth portion of a signal rotor and a pulse signal corresponding to a tooth missing portion. After the semiconductor integrated circuit chips are adhered to the substrate, the chips are connected with wirings formed on the substrate by a chip on glass method, a wire bonding method or the like, to manufacture the electric device having a liquid crystal display on one substrate. The seal between the backing and cover is preferably difficult to compromise, so that human hands have great difficulty separating the backing and cover. The rail clamping assembly is releasably securable to the internal bed rail system and includes a second clamp surface for asserting a clamping force upon the internal bed rail system. In one embodiment, the carriage stop in the second position is not in the path of movement of the second carriage.