US PATENT SUBCLASS 172 / 771
.~.~ With curved surface

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

681  DF  TOOL, STANDARD OR CONNECTION {32}
765  DF  .~ Specific tool shape {5}
771.~.~ With curved surface

DEFINITION

Classification: 172/771

(under subclass 765) Apparatus in which the earth working element has at least a portion of the surface thereof which is curved.

(1) Note. A planar blade having a mere curved edge is not included under this definition.