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F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
F04D—NON-POSITIVE-DISPLACEMENT PUMPS
F04D35/00—Pumps producing waves in liquids, i.e. wave-producers
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FR651555D1927-09-151927-09-15
Improvements to hydraulic rams, or pressure transformers based on the principle of hydraulic ramming
ExpiredFR651555A
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