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F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
F04F3/00—Pumps using negative pressure acting directly on the liquid to be pumped
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FR579455D1924-03-051924-03-05Procédé et dispositif pour la production du vide dans les appareils pour l'élévation de liquides et de masses pâteuses
ExpiredFR579455A
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