This relates to a locking system for mechanical joining of floorboards (1, 1), a floorboard having such a locking system and a flooring made of such floorboards. The locking system has mechanical cooperating structure (36, 38; 6, 8, 14) for vertical and horizontal joining of adjoining floorboards. The...http://www.google.es/patents/US6715253?utm_source=gb-gplus-sharePatente US6715253 - Locking system for floorboards
