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DUST COLLECTORS AND MIXERS FOR PARTICULATE MATERIALS; PNEUMATIC CONVEYING SYSTEMS AND COMPONENTS THEREFOR; MATERIALS HANDLING DEVICES INCLUDING ROTARY VALVES, DIVERTER VALVES, CENTRIFUGAL BLOWERS, BLOW TANKS, CYCLONE COLLECTORS AND PRODUCT RECEIVERS; AIR POLLUTION CONTROL DEVICES INCLUDING AIR FILTERS-COLLECTORS AND BIN VENTS; SIFTERS FOR PARTICULATE MATERIALS AND PARTICLE SIZE REDUCTION DEVICES INCLUDING ATTRITION MILLS, KNIFE CUTTERS AND CRUSHERS; AND BLENDERS FOR PARTICULATE MATERIALS