METAL FITTINGS AND COUPLINGS FOR SECURING TOGETHER THE PARTS IN A FURNITURE PIECE; BRACKETS FOR MOUNTING SHELVES; MEMBERS FOR SECURING PARTS TOGETHER TO FORM A JOINT; MEMBERS FOR SECURING PARTS TOGETHER TO FORM A JOINT IN WHICH THE MEMBERS ARE HIDDEN AND OUT OF SIGHT; ANGLE MEMBERS FOR SUSPENDING PARTS IN THE CONSTRUCTION IN A FURNITURE PIECE; FEET FOR A FURNITURE PIECE, OF BASE METALS AND ALLOYS THEREOF