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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F04D
NON-POSITIVE-DISPLACEMENT PUMPS
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F04D19/04
specially adapted to the production of a high vacuum, e.g. molecular pumps
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F04D19/046
Combinations of two or more different types of pumps
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