US PATENT SUBCLASS 172 / 186
.~.~ Plane and dished disks

Current as of: June, 1999
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172 /   HD   EARTH WORKING

133  DF  DIVERSE TOOLS {29}
184  DF  .~ Diverse rolling {3}
186.~.~ Plane and dished disks

DEFINITION

Classification: 172/186

(under subclass 184) Apparatus in which the earth working elements comprise circular platelike members at least one of which has all the parts thereof in a single plane and another of which is of concavo-convex shape.