US PATENT SUBCLASS 172 / 158
.~.~ All rolling

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}
158.~.~ All rolling

DEFINITION

Classification: 172/158

(under subclass 155) Apparatus in which the laterally spaced like earth working elements and the intermediate diverse earth working element are all of the rolling or rotating type.

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154, for four laterally spaced tools which are successively unlike and alternately alike, all of the tools being of the

rolling type.