US PATENT SUBCLASS 111 / 61
.~.~.~.~ Unitarily controlled

Current as of: June, 1999
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111 /   HD   PLANTING

14  DF  DRILLING {12}
52  DF  .~ Frame and planting-element arrangement {4}
59  DF  .~.~ Main and auxiliary frame {3}
60  DF  .~.~.~ Plurality of auxiliaries {1}
61.~.~.~.~ Unitarily controlled

DEFINITION

Classification: 111/61

(under subclass 60) Devices wherein movement of the auxiliaries is controlled by a single means, usually such as a lever mechanism, for elevating or depressing the earth-working elements from or toward the ground.