US PATENT SUBCLASS 137 / 78.3
.~.~ Soil moisture sensing

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

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

DEFINITION

Classification: 137/78.3

Coil moisture sensing:

(under subclass 78.2) Apparatus in which flow of water to the ground is controlled in response to a change in moisture content of the ground.