The device of the present invention, positionable in or on a golf bag, monitors golf club location. The device includes a marker mechanism, positionable on a golf club that imparts a unique identification to the club. The device also includes sensing mechanisms for sensing removal and return of the golf...http://www.google.com.tw/patents/US6023225?utm_source=gb-gplus-share專利 US6023225 - Golf equipment inventory device
