US PATENT SUBCLASS 111 / 17
.~.~.~ With automatic regulator

Current as of: June, 1999
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111 /   HD   PLANTING

14  DF  DRILLING {12}
15  DF  .~ Hill-planting machines {5}
16  DF  .~.~ Check correcting {1}
17.~.~.~ With automatic regulator

DEFINITION

Classification: 111/17

(under subclass 16) Devices comprising an alinement-maintaining means responding to movements of the planter over uneven portions of traversed ground.