An improvement in fence systems adjacent cattle gates is provided. Specifically, the fence system provides a fence post having a bumper system such that in the event that a vehicle passing the fence system hits the upright, the risk of damage to the fence system is minimized. In one form of the invention,...http://www.google.fr/patents/US5906359?utm_source=gb-gplus-shareBrevet US5906359 - Cattle gate and fence systems
