73204615
Feb 22, 1979
Dec 16, 1980
Irrigation Control Systems, Comprising Program Timers for Controlling a Series of Irrigation Outlets, Soil Moisture Sensors for Initiating and Terminating Irrigation Cycles, Vacuum Responsive Valves and Remote Controlled Valves, Sprinklers, Fittings, and Tubing Sold as a Unit
Environmental Control Apparatus