A ceiling board free from trouble due to bending is to be provided. In the ceiling board to be supported horizontally by its peripheral parts as fixed parts, the part between the fixed parts, in a state wherein it is bent by its own weight, is formed in a dome shape in a direction reverse to the direction...http://www.google.de/patents/US6969990?utm_source=gb-gplus-sharePatent US6969990 - Ceiling board, designing method for ceiling board, manufacturing method for ceiling board, magnet cover, magnet system and magnetic resonance imaging apparatus
