73158246
Feb 10, 1978
Jun 19, 1979
IRRIGATION CONTROL SYSTEMS, COMPRISING PROGRAM TIMERS FOR CONTROLLING A SERIES OF IRRIGATION OUTLETS, SOIL MOISTURE SENSING DEVICES FOR INITIATING AND TERMINATING CYCLES, VACUUM RESPONSIVE VALVES AND REMOTE CONTROL VALVES, SPRINKLERS, FITTINGS, AND TUBING
Environmental Control Apparatus