US PATENT SUBCLASS 172 / 623
.~.~ Groups abreast and in tandem

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}
623.~.~ Groups abreast and in tandem

DEFINITION

Classification: 172/623

(under subclass 619) Apparatus including two transversely aligned laterally spaced earth working element groups with each said group having longitudinally aligned therewith a trailing group, all of said groups being vertically movable relative to one another.