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F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
F04C19/005—Details concerning the admission or discharge
F04C19/008—Port members in the form of conical or cylindrical pieces situated in the centre of the impeller
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FR747224D1931-12-111932-12-08
Rotary receiving or driving machine with rotor fitted with blades, wings, etc.
ExpiredFR747224A
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