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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F04C
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
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18/00
Rotary-piston pumps specially adapted for elastic fluids
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F04C18/30
having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
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F04C18/34
having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
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F04C18/356
with vanes reciprocating with respect to the outer member
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