US PATENT SUBCLASS 416 / 139
.~ Including weight bias means

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

131  DF  ARTICULATED, RESILIENTLY MOUNTED OR SELF-SHIFTING IMPELLER OR WORKING MEMBER {7}
139.~ Including weight bias means

DEFINITION

Classification: 416/139

(under subclass 131) Apparatus wherein the impeller or working member movement is either aided or resisted by a weight other than the impeller or working member itself.