機械及設備，機電設備及部件，設備或複製，錄音，電視圖像及聲音錄製或重放器具，及這類製品的零件及附件, 84 Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof, 84.43 -printing machinery used for printing by means of plates, cylinders and other printing components of heading 8442; other printers, copying machines and facsimile machines, whether or not combined; parts and accessories thereof:, 業務