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2. Potato cannon - Wikipedia

   en.wikipedia.org/wiki/Potato_cannon

   PVC dry ice cannon in use, 1.5kg (3 pounds) of concrete is poured at the bottom to reinforce it, and plastic sleeves are used to stiffen the lower (highest pressure) part. The oldest examples simply involve dropping pieces of dry ice into a tube closed at one end and sealing the other end by jamming the projectile in.

3. 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 ...

4. 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.

5. Slazenger - Wikipedia

   en.wikipedia.org/wiki/Slazenger

   Slazenger (/ ˈ s l æ z ə n dʒ ər /) is a British sports equipment brand owned by the Frasers Group (formerly Sports Direct). [1] One of the world's oldest sport brands, the company was established as a sporting goods shop in 1881 by entrepreneurial brothers, Ralph and Albert Slazenger, on Cannon Street, London. [2]

6. Tennis ball - Wikipedia

   en.wikipedia.org/wiki/Tennis_ball

   This is an accepted version of this page This is the latest accepted revision, reviewed on 2 January 2025. Ball used in the sport of tennis Tennis balls at the 2012 French Open A tennis ball is a small, hollow ball used in games of tennis and real tennis. Tennis balls are fluorescent yellow in professional competitions, but in recreational play other colors are also used. Tennis balls are ...

7. ProKennex - Wikipedia

   en.wikipedia.org/wiki/ProKennex

   ProKennex is a Taiwanese manufacturer of racquet sports equipment for tennis, squash, badminton, racquetball, and pickleball.The company enjoyed wide global distribution in the 1980s, when manufacturing in Taiwan was booming due to domestic economic conditions.