PRODUCTS MADE OF STEEL, AND OTHER MATERIALS-NAMELY, COLUMN-HOOPING FOR REINFORCING CONCRETE COLUMNS; CURB-BARS AND EDGE PROTECTORS MADE OF STEEL IN VARIOUS FORMS, USED TO PROTECT AND REINFORCE CONCRETE CURBS, EXPOSED CORNERS AND EDGES OF WALLS, PILASTERS, COLUMNS, PLATFORMS,SIDEWALKS, ECT; DOORS, PANELS, AND PARTITIONS, ALL MADE OF STEEL OR OF STEEL AND GLASS AND INTENDED AS PERMANENT STRUCTURAL ELEMENTS OF A BUILDING; JOIST OR WALL HANGERS MADE OF STEEL FOR JOIST OR BEAM CONNECTIONS; DOWEL B...