Machine Shop. Workers and machines in shop - gear cutting machine - close-up - shaving machine - gear tooth inspection - clQs~~up ~ bow toothing - panorama of room - workers at piston assembly line - close-up - butt welding machine - boring machine drilling cylinder block - crankshaft and grinding machine in operation - crankshafts on overhead conveyor - crankshaft hardening machine - workers on valve assembly line - worker testing and inspecting valves - view of broaching machine making bearing liners - worker inspecting bearing liner