US PATENT SUBCLASS 172 / 616
.~.~.~ Bars pivoted about vertical axis

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

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
614  DF  .~ Tool pivots on pivoted member when member moves {1}
615  DF  .~.~ Tools connected to parallel pivoted bars {1}
616.~.~.~ Bars pivoted about vertical axis {1}
617  DF  .~.~.~.~> Also pivoted about horizontal axis

DEFINITION

Classification: 172/616

(under subclass 615) Apparatus in which the parallel bars are mounted to pivot about vertical axes to allow the parallel bars to swing in a horizontal plane.