An operation member is provided with a planar input device, and a detachable display sheet is overlaid on the surface of the planar input device. There are two types of display sheets, in which input items are different. Cutouts are formed at the respective peripheral edge portions thereof, and a determination...http://www.google.de/patents/US6761315?utm_source=gb-gplus-sharePatent US6761315 - Controller capable of operating plural operation objects by switching display of operation surface of operation member
