A score keeping game system (100) for tracking the performance of at least one athlete is provided. Score keeping game system (100) includes at least one score tracking device (10), the score tracking device including a card member (60) and jacket (70). Card member (60) includes a recording section (66)...http://www.google.com.hk/patents/US5788283?utm_source=gb-gplus-share專利 US5788283 - Score keeping game system
