US PATENT SUBCLASS 172 / 630
.~.~ Groups pivoted to opposite sides of longitudinal draft member

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}
630.~.~ Groups pivoted to opposite sides of longitudinal draft member

DEFINITION

Classification: 172/630

(under subclass 619) Apparatus in which the earth working element groups are mounted for pivotal movement on opposite sides of a longitudinal rod or beam which serves as a draft beam.