F04Level 2

POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS

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F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS

F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS

F04DNON-POSITIVE-DISPLACEMENT PUMPS

F04FPUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED

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