Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F04
POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
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F04B
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
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1/00
Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
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F04B1/12
having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
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F04B1/20
having rotary cylinder block
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F04B1/22
having two or more sets of cylinders or pistons
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