The front panel of a control panel is provided with a recess for receiving a keypad. The recess is larger than the keypad to define a channel between the edges of the keypad and the sides of the recess. A sealant fills the channel to provide a smooth transition between the front panel and the keypad...http://www.google.fr/patents/US5430266?utm_source=gb-gplus-shareBrevet US5430266 - Control panel with sealed switch keypad
