US PATENT SUBCLASS 37 / 251
.~.~.~.~ And centrifugal impeller for final stage

Current as of: June, 1999
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37 /   HD   EXCAVATING

196  DF  SNOW OR ICE REMOVING OR GROOMING BY PORTABLE DEVICE {16}
244  DF  .~ Motorized rotary excavating tool {8}
248  DF  .~.~ Diverse multistage rotary tools or tool portions (e.g., feeding and throwing, etc.) {1}
249  DF  .~.~.~ Including screw-type auger for first stage {2}
251.~.~.~.~ And centrifugal impeller for final stage {1}
252  DF  .~.~.~.~.~> Auger and impeller on single shaft

DEFINITION

Classification: 37/251

And centrifugal impeller for final stage:

(under subclass 249) Apparatus wherein the implement or section adapted to accomplish the last setup includes a generally radially projecting vane means which transports snow or ice by centrifugal force.