A land irrigation system in which a traveling sprinkler line is supplied with water from a stationary water supply conduit extending in the direction of movement of the sprinkler line, the apparatus of the invention being designed to supply water to the sprinkler line from spaced risers forming part...http://www.google.fr/patents/US4295607?utm_source=gb-gplus-shareBrevet US4295607 - Land irrigating system and method
