.~ Plural tool groups relatively vertically movable because of operation {9}
631
.~.~ Groups movable about common longitudinal axis
DEFINITION
Classification: 172/631
(under subclass 619) Apparatus comprising adjacent earth working element groups relatively pivotable about the same axis which extends substantially in or parallel to the line of draft.
SEE OR SEARCH THIS CLASS, SUBCLASS:
623, for groups of tools abreast and in tandem which may also be movable about a common longitudinal axis.
627, for groups of tools connected to each other for relative vertical movement which movement may be about a common longitudinal axis.
