A locking cap for a container has a combination lock built into the top. Two or more thumbwheels with numbers or letters are mounted beneath the top surface of the cap or gung plugs. The thumb wheels have through holes corresponding to the numbers or letters. One or more pins are slidably mounted in...http://www.google.es/patents/US7600648?utm_source=gb-gplus-sharePatente US7600648 - Bottle cap with combination lock
