US PATENT SUBCLASS 172 / 78
.~.~ Vertically adjustable ground support


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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
76  DF  .~ Implement with ground support for depth control {3}
78.~.~ Vertically adjustable ground support


DEFINITION

Classification: 172/78

(under subclass 76) Apparatus in which the ground contacting supporting member is adapted to be vertically adjustably connected to the driven implement whereby the normal working

depth of the earth working element may be altered by moving said ground-contacting supporting members from one vertical position to another.

(1) Note. See the class definition for the meaning of "adjustable".