A metallic ceiling lining consists of a supporting grid of longitudinal struts and transverse struts and cassettes arranged in the grid compartments. The longitudinal struts and transverse struts have their lower ends. The cassettes rest in a gastight manner on the projections and the longitudinal struts...http://www.google.fr/patents/US4944129?utm_source=gb-gplus-shareBrevet US4944129 - Ceiling lining
