A construction unit of generally rectangular parallelepiped shape, comprising a rectangular slab of reinforced concrete with a peripheral rib and square cross-section metallic tubular columns welded to the corners of the slab on metallic brackets thereon, the outer faces of the columns being an extension...http://www.google.es/patents/US3983673?utm_source=gb-gplus-sharePatente US3983673 - Volumic construction element of generally rectangular parallelepiped shape
Volumic construction element of generally rectangular parallelepiped shape
