MACHINERY AND TOOLS AND PARTS THEREOF-NAMELY, POWDERED METALLURGICAL MACHINERY AND TOOL PARTS-NAMELY, DISC BRAKES FOR INDUSTRIAL MACHINES, PADS FOR DISC BRAKES, AND SELF-LUBRICATING POROUS METAL BEARINGS, CEMENTED CARBIDE TOOLS, SINTERED METAL MACHINERY AND TOOL PARTS AND BUSHINGS-NAMELY, DISC BRAKES FOR INDUSTRIAL MACHINES, PADS FOR DISC BRAKES AND SELF-LUBRICATING POROUS METAL BEARINGS