A panel is described for use as a building component. It comprises: (a) a plurality of C-shaped sheet steel channel beams each having a central web and an inner and outer edge flange, said inner flanges having cuts therein at longitudinally spaced locations to form upwardly projecting lugs and said beam...http://www.google.es/patents/US4885884?utm_source=gb-gplus-sharePatente US4885884 - Building panel assembly
