13 Hardware of Metal and Plastic-Namely, Nails, Rivets, Screws and Nuts of All Kinds, Bolts, Screw Bolts,[ Spacer Bolts, ] Studs,[ Hooks, Chains, Flanges, ] Dowels, Pegs, Plugs, Lugs,[ Eyelets, ] Rings, Clamps, Clips, Brackets,[ Pipe Saddles, Pipe Straps, ] Guide Rings, Guide Sleeves, Guide Springs; Material for Constructing and Assembling Gas Plants, Water Plants, Steam Plants, Sewage Plants, Heating Plants, Industrial Plants and Building Constructions-Namely,(( Locksmith and)) Blacksmith Goods, Formed Metal Parts Produced by Hand or Machine, Rolled and Cast Construction Material, Machine Casting; Installation Material for Electrical Wiring, Radio and Television; Protective Caps for Protection Against Splinters and Debris; Sleeves, Connecting Elements, Sockets, Bushings