Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F04
POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
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F04B
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
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47/00
Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
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F04B47/02
the driving mechanisms being situated at ground level
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F04B47/04
the driving means incorporating fluid means
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