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The device grasps an instant vibration generated by a table tennis touching the ball net, and prompts the judger through the alarm that the table tennis touches the ball net. The device is simple in structure, convenient in operation, low in cost, reduces misjudges in a game, and then ...
The invention relates to a method of monitoring the keeping within boundaries of a playing area, as well as the touching of the net cord, in particular of tennis courts, and to the devices for carrying it out. According to the invention, to achieve this object it is basically proposed to...