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MATERIAL HANDLING EQUIPMENT-NAMELY, PNEUMATIC CONVEYING EQUIPMENT FOR COMMINUTED MATERIALS INCLUDING CONDUITS, BLOWERS, FEEDING APPARATUS, DISCHARGE DEVICES, CAR LOADING APPARATUS, AND CENTRIFUGAL SEPARATORS, APPARATUS FOR FRACTIONATING WOOD CHIPS, APPARATUS COMPRISING A TILTING PLATFORM FOR DUMPING TRUCK TRAILERS, APPARATUS COMPRISING CHIP ENGAGING ELEMENTS FOR REMOVING MATERIAL FROM THE BOTTOM OF STOCK PILES, AND PARTS THEREFOR