Patent Class: Fluid Reaction Surfaces (I.E., Impellers) (416/500)

This class provides the locus for all fluid impellers* not elsewhereclassifiable. (1)Note. The working fluid*, which is acted on by oracts upon the impeller, may be a liquid or gas.This class also takes miscellaneous subcombinations of impellersand accessory devices when the subcombination or accessory is limitedin use to the combination or not elsewhere classifiable.