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F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
F04B3/00—Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage
F04B3/003—Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage with two or more pistons reciprocating one within another, e.g. one piston forning cylinder of the other
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FR729477D1931-03-161931-03-16Perfectionnements apportés aux pompes et aux procédés utilisés pour leur fabrication
ExpiredFR729477A
(fr)