US PATENT SUBCLASS 172 / 627
.~.~.~ Groups also connected to one another

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

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
619  DF  .~ Plural tool groups relatively vertically movable because of operation {9}
624  DF  .~.~ Plural groups movably connected to forward transverse draft bar {4}
627.~.~.~ Groups also connected to one another

DEFINITION

Classification: 172/627

(under subclass 624) Apparatus in which the earth working element groups additionally have means connecting one earth working element group to an adjacent earth working element group.