Collars of metal for fastening pipes; [ Copper, unwrought or semi-wrought; Ferrotitanium; Iron slabs; Locks of metal, other than electric; ] Metal bottle caps; [ Metal conduit; ] Metal elbows for pipes; [ Metal flanges; Metal keys for locks; ] Metal nipples; Metal pipe connectors; Metal pipe fittings for compressed air pipes; Metal pipe muffs; [ Metal, wash down spray nozzles for commercial and industrial use; Reinforcing materials of metal for pipes; ] Screw tops of metal for bottles; [ Stee...