US PATENT SUBCLASS 37 / 206
.~.~.~.~ And scraper blade

Current as of: June, 1999
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37 /   HD   EXCAVATING

196  DF  SNOW OR ICE REMOVING OR GROOMING BY PORTABLE DEVICE {16}
198  DF  .~ Railway clearer {7}
203  DF  .~.~ For clearing single rail of set {3}
205  DF  .~.~.~ Including rotary excavating tool {1}
206.~.~.~.~ And scraper blade

DEFINITION

Classification: 37/206

And scraper blade:

(under subclass 205) Apparatus also including a transversely extending, generally vertically disposed moldboard.