Building system comprising individual building elements (1), each element having an upper and a lower surface which are substantially parallel to each other and each building element having at least one opening (10, 11) extending from the upper surface to the lower surface, the building elements being...http://www.google.es/patents/US6282859?utm_source=gb-gplus-sharePatente US6282859 - Building system comprising individual building elements
Building system comprising individual building elements
