US PATENT SUBCLASS 416 / 126
.~.~ Concentric working members

Current as of: June, 1999
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416 /   HD   FLUID REACTION SURFACES (I.E., IMPELLERS)

120  DF  PLURAL IMPELLERS HAVING RELATIVE MOVEMENT OR INDEPENDENT SUPPORTS {5}
124  DF  .~ Coaxial rotation {4}
126.~.~ Concentric working members

DEFINITION

Classification: 416/126

(under subclass 124) Apparatus wherein the coaxial impellers rotate one inward of the other on the same radial plane.