A method and apparatus for tracking and determining a location of a gaming machine or other item within a casino or hotel is disclosed. In one embodiment the method and apparatus utilizes a transmitter or emitter to provide a tracking signal that may be tracked by one or more receivers or detectors....http://www.google.es/patents/US20050255919?utm_source=gb-gplus-sharePatente US20050255919 - Method and apparatus for machine location
