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F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
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FR672980D1929-04-111929-04-11Dispositif de portée compensatrice à ressort, pour pompes insérées dans des tubages de puits profonds
ExpiredFR672980A
(fr)