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2. Electronic line judge - Wikipedia

   en.wikipedia.org/wiki/Electronic_line_judge

   The foot fault judge used directional microphones to detect the striking of the ball by the player's racquet, when serving the ball, that functioned in conjunction with a timing circuit to detect if the players foot had activated the baseline line "IN" sensor immediately prior to, or during, the striking of the ball.

3. Squash ball machine - Wikipedia

   en.wikipedia.org/wiki/Squash_ball_machine

   The balls used in squash are small rubber balls that can differ in terms of diameter, weight and softness. These features determine the speed and bouncing amplitude of the ball, with softer balls being generally slower than the harder balls. The temperature of the ball also affects the amount of bounce: the warmer the ball, the more it bounces. [3]

4. Bowling machine - Wikipedia

   en.wikipedia.org/wiki/Bowling_machine

   These machines will work with any ball of roughly the right size and weight, such as normal cricket balls or tennis balls. However, they usually work best with their own balls, bowling machine balls which are made of hard plastic, and are covered in dimples. These dimples are to help the spinning wheels grip the ball and, for example, improve ...

5. I’ve found 10 pawfect Christmas gifts that will get your dog ...

   www.aol.com/ve-found-10-pawfect-christmas...

   PetSafe Automatic Dog Ball Launcher | £169.95 on Amazon. This super-cool ball launcher lets your dog play fetch while saving your back! The launcher is equipped with a motion sensor to prevent ...

6. Prince Sports - Wikipedia

   en.wikipedia.org/wiki/Prince_Sports

   The company was founded in 1970 by Robert Hirt McClure (1893–1991) of Princeton, New Jersey (the origin of the company's name) as a manufacturer of tennis-ball machines, and soon after, rackets. Howard Head , founder of the Head sporting goods company, took tennis lessons following his retirement and used a Prince tennis ball machine, but was ...

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