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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17/00
Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
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F04D17/16
for displacing without appreciable compression
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F04D17/164
Multi-stage fans, e.g. for vacuum cleaners
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