A programmable sprinkler system ideally suited for use in an enclosure such as a nursery and/or arboretum includes a first overhead rail and a water pipe connected to a pressurized source of water. The water pipe is provided with a plurality of water valves placed at discreet intervals along its length...http://www.google.fr/patents/US4723714?utm_source=gb-gplus-shareBrevet US4723714 - Programmable sprinkler system
