23 MACHINERY FOR THE PROCESS INDUSTRIES-NAMELY, SLAKERS; BALL, PEBBLE, WASH, TUBE, ROD, AND COMBINATION ROD AND TUBE GRINDING MILLS; GYRATORY, JAW, AND ROLL CRUSHERS; APRON GRIZZLEY, TABLE, AND SLURRY FEEDERS; NON-REFRIGERATING ROTARY COOLERS; HOT MATERIAL CONVEYORS; WASH MILLS; AND CASTING MACHINES, AND PARTS THEREOF