MACHINE PARTS, NAMELY, PERFORATED, DRILLED, PUNCHED, SLOTTED, MILLED, ELECTRON BEAM-BOARD PLATES AND DRUMS IN THE NATURE OF SCREENS AND SCREEN PLATES FOR SORTING, SCREENING AND SEPARATING SOLIDS FROM FLUIDS OF DIFFERENT KINDS OF SUSPENSIONS

PERFORATED PLATES AND DRUMS, PARTICULARLY SCREENS AND SCREEN PLATES USED IN MACHINERY FOR SORTING, SCREENING OR SEPARATING SOLIDS FROM FLUIDS OR DIFFERENT KINDS OF SUSPENSIONS