US PATENT SUBCLASS 416 / 216
.~.~ Radially spaced ribs or grooves

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

204 R  DF  SPECIFIC WORKING MEMBER MOUNT {9}
215  DF  .~ Blade received by continuous circumferential channel {3}
216.~.~ Radially spaced ribs or grooves

DEFINITION

Classification: 416/216

(under subclass 215) Apparatus in which the blade portion and channel wall, or a packing or securing means therebetween, have a plurality of elongated, radially spaced, interfitting channels and ridges.