US PATENT SUBCLASS 172 / 658
.~.~ With interconnecting means to prevent independent lateral movement

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

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
657  DF  .~ Relatively movable because of operation {1}
658.~.~ With interconnecting means to prevent independent lateral movement

DEFINITION

Classification: 172/658

(under subclass 657) Apparatus in which the earth working elements during operation are each capable of vertical displacement independently of the other and means is provided for so joining the earth working elements one to the other that independent lateral displacement of said elements is precluded.