73086956
May 13, 1976
Dec 6, 1977
IRRIGATION SYSTEMS, CONSISTING ESSENTIALLY OF ONE OR MORE LENGTHS OF CONDUIT HAVING APERTURES AT SPACED LOCATIONS IN THE SIDE WALLS THEREOF IN A PORTION OR ALL OF THE LENGTHS OF SAID CONDUITS, A FLUID PERVIOUS FABRIC MATERIAL BEING SECURED ABOUT THE OUTSIDE OF SAID CONDUIT ENCOMPASSING THE AFORESAID APERTURES
Environmental Control Apparatus