US PATENT SUBCLASS 172 / 152
.~ At least four alternately diverse laterally spaced tools (A, B, A, B)

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

133  DF  DIVERSE TOOLS {29}
152.~ At least four alternately diverse laterally spaced tools (A, B, A, B) {2}
153  DF  .~.~> Alternate rolling and non-rolling
154  DF  .~.~> All rolling

DEFINITION

Classification: 172/152

(under subclass 133) Apparatus comprising four or more earth working elements spaced laterally of the direction of travel, the elements being alternately alike, but successively unlike.

(1) Note. The alternate earth working elements may consist of a group of like tools.

SEE OR SEARCH THIS CLASS, SUBCLASS:

155+, for laterally spaced like tools with an intermediate diverse tool.