US PATENT SUBCLASS 416 / 135
.~ Resilient bias or mount

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}
135.~ Resilient bias or mount {2}
136  DF  .~.~> Rotary working member pivotable solely about radial axis {1}
138  DF  .~.~> With manual control means

DEFINITION

Classification: 416/135

(under subclass 131) Apparatus wherein the impeller or working member movement is resisted by a resilient element which tends to restore the impeller or member to an original or predetermined position.