7415: Nail, tack, etc of copper/of i/ w head of cop; screw, bolt, sim art o

741510: Nails, tacks, drawg pins, staples & sim art of copper or i/s w copper 741521: Washers, copper, including spring washers 741529: Articles of copper, not threadd, nes, sim to those of headg 7415.10 & 741531: Screws, copper, for wood 741532: Screws, bolts and nuts of copper excluding wood screws 741539: Articles of copper threaded, nes similar to bolts, nuts and screws 7415: Nail, tack, etc of copper/of i/ w head of cop; screw, bolt, sim art o