Manufacturing and sales of railway parts, rolling stock parts, signal insulation parts, hydraulic seals, mining machinery parts, rubber pads for railway concrete sleeper rails, injection-molded parts, hydraulic hose assemblies, epoxy resin laminates, wiring harnesses, rubber compounds, rubber products, non-metallic materials, refractory materials, and hardware tools; sales of hardware products, electromechanical products, labor protection supplies, and timber.