The invention relates to a method and equipment intended therefore for making a building board 2, comprising a body 5 fitted with a locking device in the form of a strip 10 extended from the body 5 with a formed locking surface 14 for mechanical joining of the board 2 to similar boards, the strip 10...http://www.google.com/patents/US6094882?utm_source=gb-gplus-sharePatent US6094882 - Method and equipment for making a building board
