An assembly for a mobile terminal, or a portable electronic device such as a cellular telephone or a personal digital assistant, is provided that includes a chassis with a locking perimeter and at least one covering, such as a front and/or a rear cover, with a locking edge. A cover may include a void...http://www.google.de/patents/US7236588?utm_source=gb-gplus-sharePatent US7236588 - Interlocking cover for mobile terminals
