A device for the production of a surface drainage a helicoidal guide surfaces on existing lawn

• 1. 一种不透水地面的蓄排水装置 [P] . 中国专利： CN215053643U . 2021-12-07
• 2. 一种楼房地面的双排水装置 [P] . 中国专利： CN213329305U . 2021-06-01
• 3. A device for the production of a surface drainage a helicoidal guide surfaces on existing lawn [P] . 德国专利： DE2164116C3 . 1975-07-24

  机译： 一种在现有草坪上产生螺旋排水面的地面排水装置

• 4. A device for the production of a surface drainage a helicoidal guide surfaces on existing lawn [P] . 德国专利： DE2164116A1 . 1973-07-05

  机译： 一种在现有草坪上产生螺旋排水面的地面排水装置

• 5. device for the production of the existing surface drainage of lawn [P] . BE782995A . 1972-09-01

  机译： 用于生产草坪现有地面排水设备

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