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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. Cyclops (computer system) - Wikipedia

   en.wikipedia.org/wiki/Cyclops_(computer_system)

   Cyclops is a computer system co-invented by Bill Carlton of Great Britain and Margaret Parnis England of Malta, [1] which is used on the ATP and WTA professional tennis tours as an electronic line judge to help determine whether a serve is in or out.

4. Tennis technology - Wikipedia

   en.wikipedia.org/wiki/Tennis_technology

   Originally the tennis ball consisted of rough cloth strips tightly bound together. Eventually the cloth strips became the core, wrapped in twine and covered by a finer cloth or felt hand-stitched around it. [6] In 1972, at the request of Lamar Hunt to televise World Championship Tennis, the tennis ball was manufactured with the optic yellow ...

5. Category:Tennis equipment - Wikipedia

   en.wikipedia.org/wiki/Category:Tennis_equipment

   Stringing machine; Strings (tennis) T. Tennis technology; Tennis ball; W. Wilson K-Factor; Wilson ProStaff Original 6.0 This page was last edited on 8 October ...

6. Gyroscopic exercise tool - Wikipedia

   en.wikipedia.org/wiki/Gyroscopic_exercise_tool

   The device consists of a tennis ball-sized plastic or metal shell surrounding a free-spinning mass, with an inner heavy core, which can be spun by a short rip string or using a self-start mechanism by means of rewinding it against a spring to give it potential energy.

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