US PATENT SUBCLASS 172 / 160
.~.~ Including spike tooth

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

133  DF  DIVERSE TOOLS {29}
155  DF  .~ Laterally spaced like tools with intermediate diverse tool (A, B, A) {5}
160.~.~ Including spike tooth

DEFINITION

Classification: 172/160

(under subclass 155) Apparatus in which one of the earth working elements comprises a straight tooth of uniform or decreasing diameter in a downward direction.