Apparatus of adjustable length in order to maintain the racket to the appropriate position for the playing of tennis lawn -

• 1. 一种用于腿部患者的角度和位置可调的腿部支撑装置 [P] . 中国专利： CN213666338U . 2021-07-13
• 2. 一种用于污水处理池可调节高度位置的水位监控装置 [P] . 中国专利： CN107782404A . 2018-03-09
• 3. Tennis racket accessory, has two masses that are moved towards head of racket when player strikes strong stroke, to modify equilibrium of racket, and that remains in handle position when player strikes touch stroke [P] . 法国专利： FR2856310A1 . 2004-12-24

  机译： 网球拍配件组成，具有正朝着球拍的头当球员罢工强中风，改变球拍的平衡移动两个质量，并留在手柄位置，当玩家碰到触摸行程

• 4. Handle device adjusting the length of a racket, particularly a tennis racket. [P] . ES289153Y . 1987-09-16

  机译： 调节球拍，尤其是网球拍的长度的手柄装置。

• 5. Tennis racket with racket having adjustable length handle [P] . 美国专利： US4641838A . 1987-02-10

  机译： 带有长度可调的球拍的网球拍

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