An electromechanical indicator including a body with an axis of rotation. The rotary body is provided with a number of segments radiating from the axis of rotation which are associated with at least two different indicia. A motor is coupled to the rotary body such that the rotary body is adapted for...http://www.google.de/patents/US7100916?utm_source=gb-gplus-sharePatent US7100916 - Indicator wheel system
