US PATENT SUBCLASS 137 / 78.2
.~ For controlling soil irrigation

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

78.1  DF  AMBIENT CONDITION CHANGE RESPONSIVE {4}
78.2.~ For controlling soil irrigation {1}
78.3  DF  .~.~> Soil moisture sensing

DEFINITION

Classification: 137/78.2

For controlling soil irrigation:

(under subclass 78.1) Apparatus in which flow of water to the ground is controlled by means responsive to an environmental condition.