An irrigation line move operates fully automatically for twenty-four hours and includes a prime mover carriage carrying a gasoline engine which drives a pipe of a wheel line through a hydraulic drive system, and the wheel pipe, through a first planetary transmission, drives a shaft paralleling the pipe....http://www.google.fr/patents/US4291837?utm_source=gb-gplus-shareBrevet US4291837 - Automatic multiple move irrigation line
