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PUMPS FOR GATHERING WATER, STRIPPING SLUDGE, PUMPING STARCH ADHESIVE AND PUMPING LIQUIDS AND THE LIKE; STRAINER MACHINES FOR STRAINING LIQUIDS; SKIMMER MACHINES FOR RECOVERING OIL, LIQUID, AND OTHER EFFLUENTS IN WATER; OIL RECOVERY UNITS; OILY WATER SEPARATORS; AND OIL PUDDLE MOP MACHINES FOR REMOVING OIL FROM SHALLOW PUDDLES, DRAINS, AND CULVERTS