The present invention is directed to a method and apparatus for installing a utility conveyance. A tractor which includes sensors, a plow locator and a monitor system is presented. The sensors are used to locate markers, which identify the boundaries of a right of way or a preexisting utility conveyance....http://www.google.fr/patents/US7199723?utm_source=gb-gplus-shareBrevet US7199723 - Cable plow installation monitor method and apparatus
Cable plow installation monitor method and apparatus
