A device and apparatus for aligning exterior faces of tiles of irregular thickness in which elongated alignment grooves are formed in edges of the tiles spaced apart from the exterior faces by a constant setback distance and a front tongue of a spacer shaped like an extruded cross is inserted into the...http://www.google.es/patents/US5623799?utm_source=gb-gplus-sharePatente US5623799 - Device and process for mounting tiles of varying thickness
Device and process for mounting tiles of varying thickness
