A control device is provided with a controllable element and a control unit that delivers an output signal which, when a control command signal applied to the input side is at an activating level, continuously or periodically assumes an activating level and continuously assumes a deactivating level when...http://www.google.se/patents/US5909174?utm_source=gb-gplus-sharePatent US5909174 - Control device, especially for vehicle braking light control
