An actuator having electronically controllable tactile responsiveness which is flexibly programmable to facilitate provision in a single actuator of torque-position characteristics, such as a selectable number of detents per actuation through its full operative path. A rotary actuator facilitates provision...http://www.google.co.uk/patents/US5559412?utm_source=gb-gplus-sharePatent US5559412 - Actuator having electronically controllable tactile responsiveness
