Engineering and technical research and experimental development; hardware product research and development; hardware product manufacturing; hardware product retail; furniture spare parts production; furniture spare parts sales; import and export of goods; import and export of technology; metal tool sales; seal sales; fastener sales; power distribution switchgear equipment sales; valve and cock sales; plastic product sales; rubber product sales; mechanical equipment sales; electronic product sales; commercial, catering, and service-specific equipment sales; hand carts and livestock-drawn vehicle sales; tire sales; non-metallic mineral products and their products sales; bearing, gear, and transmission component sales; metal product sales.