US PATENT SUBCLASS 111 / 7.3
.~.~.~ Work operated valve

Current as of: June, 1999
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111 /   HD   PLANTING

118  DF  LIQUID OR GAS SOIL TREATMENT {6}
7.1  DF  .~ Hand manipulated {1}
7.2  DF  .~.~ Implement carried supply {2}
7.3.~.~.~ Work operated valve

DEFINITION

Classification: 111/7.3

(under subclass 7.2) Devices having a fluid control valve operated solely by contact of the implement with the ground.