Resilient spacers inserted in the network formed by the strings of the tennis rackets, and the instrument in order to carry out this operation

• 1. 图像形成装置及在该图像形成装置中执行操作的方法 [P] . 中国专利： CN102572167B . 2017.03.01
• 2. 图像形成装置及在该图像形成装置中执行操作的方法 [P] . 中国专利： CN102572167A . 2012-07-11
• 3. in the elastic supports network formed by the strings of tennis rackets, and device to carry out this operation [P] . BE383339A . 1931-11-30

  机译： 网球拍的绳子形成的弹性支撑网中的装置以及执行该操作的装置

• 4. Spacers for reducing the wear of tennis, squash and badminton racket strings, and device for inserting them [P] . 欧洲知识产权局专利： EP0252168B1 . 1991-01-30

  机译： 用于减少网球，壁球和羽毛球拍线的磨损的垫片及其插入装置

• 5. Spacers for use as string protectors for tennis, squach and badminton rackets, and device for inserting these parts [P] . 美国专利： US4863168A . 1989-09-05

  机译： 用作网球，壁球和羽毛球拍的弦线保护垫的垫片以及用于插入这些部件的装置

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