6
Ingots of common metals and their alloys for further manufacturing; metal building materials, namely, metal gutters, metal gullies, metal shafts, and metal coverings and metal parts for the aforesaid goods
17
Rubber and gum for use in the manufacture of a surface drainage systems; plastic composite material in the form of profiles, boards, sheets, blocks, rods, powder, and pellets for use in manufacturing; extruded plastic in the form of bars, blocks, pellets, rods,sheets and tubes for use in manufacturing; packing material for forming seals; non-metal seals for use in insulating and stopping; non-metallic tubes, namely, rubber, synthetic plastic tubes, and paper tubes
19
Non-metallic building materials, namely, gutters, gullies, shafts, and parts and coverings therefore all made of concrete, plastic concrete, and plastic