US PATENT SUBCLASS 172 / 660
.~.~ Concurrent adjustment

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

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
659  DF  .~ Adjustable about spaced horizontal axes {1}
660.~.~ Concurrent adjustment

DEFINITION

Classification: 172/660

(under subclass 659) Apparatus in which the earth working elements are so interconnected one to the other that pivotal adjustment of one element will cause a simultaneous adjustment of the others.