| 摘要 |
To avoid disputes as to which players have the next turn to use a tennis court, a container is mounted at a convenient location such as on the fence surrounding the court. The player deposits a suitably distinctively marked ball in the open top of the container, resting on previously deposited balls. A stop spaced below the open bottom of the container prevents balls from dropping out. The gap between the stop and the bottom edge of the container is slightly less than the diameter of the ball; however, when the bottom ball is pulled, it distorts sufficiently to pemit removal.
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