Bulldozer grading attachment for crawler tractors

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  机译： 履带式拖拉机的升降平地机附件

• 4. Ripper and winch assemblies for a bulldozer crawler tractor [P] . 美国专利： US9702111B2 . 2017-07-11

  机译： 推土机履带拖拉机的松土器和绞车组件

• 5. APPARATUS FOR BULLDOZER CRAWLER TRACTOR [P] . 美国专利： US2017058482A1 . 2017-03-02

  机译： 推土机履带拖拉机的装置

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