賤金屬賤金屬及細則, 73 Articles of iron or steel, 73.21 -stoves, ranges, grates, cookers (including those with subsidiary boilers for central heating), barbecues, braziers, gas rings, plate warmers and similar nonelectric domestic appliances, and parts thereof, of iron or steel:, 73.21.1 -stoves, ranges, grates, cookers (including those with subsidiary boilers for central heating), barbecues, braziers, gas rings, plate warmers and similar nonelectric domestic appliances, and parts thereof, of iron or steel: --cooking appliances and plate warmers, 73.21.11.00 -stoves, ranges, grates, cookers (including those with subsidiary boilers for central heating), barbecues, braziers, gas rings, plate warmers and similar nonelectric domestic appliances, and parts thereof, of iron or steel: --cooking appliances and plate warmers ---for gas fuel or for both gas and other fuels:, 業務