A digitial electronic foot pedal control system, especially for medical apparatus and the like having a plurality of operating functions which can be selected among, comprises a pivotally mounted pedal shaft and a foot-operated pedal fixed to the shaft to pivot therewith. Included are a shaft encoder...http://www.google.com.tw/patents/US4983901?utm_source=gb-gplus-share專利 US4983901 - Digital electronic foot control for medical apparatus and the like
