An image signal captured by a camera head and outputted from an image processor is inputted into a foot switch control device. The image signal is processed in a display control unit of the foot switch control device, inputted into a display and displayed thereon. The display control unit reads out an...http://www.google.de/patents/US20050049458?utm_source=gb-gplus-sharePatent US20050049458 - Switch control apparatus for controlling functions of a switch by displaying information relating to the switch controlling a plurality of medical devices
