US PATENT SUBCLASS 416 / 89
.~ Having pitch adjustment

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

87  DF  RADIALLY EXTENSIBLE OR RETRACTIBLE ROTOR WORKING MEMBER {2}
89.~ Having pitch adjustment

DEFINITION

Classification: 416/89

(under subclass 87) Apparatus wherein the blade angle* of the working member may be selectively varied.