(under subclass 36) Method or apparatus wherein the drainage or irrigation takes place (a) in response to a sensed characteristic, e.g., soil moisture content, or (b) under the control of a timer.
SEE OR SEARCH CLASS
137, Fluid Handling,
78+, for miscellaneous fluid handling systems in which fluid flow is controlled in response to a change in an atmospheric condition.
239, Fluid Sprinkling, Spraying, and Diffusing,
63, for fluid sprinkling systems responsive to ground moisture content and including an above-ground terminal outlet.
