| 摘要 |
This invention relates to an underground drainage machine that can be fixed to a three-point linkage 2 of an agricultural tractor 1 and which comprises a main frame 4, which can be swivelled in a vertical plane by means of its own hydraulic cylinder piston arrangement 3, and a plough 7, arranged at its free end and provided with a laying chute 6 for an underground drainage pipe 5. The invention is characterized in that the plough 7, by means of its own hydraulic cylinder piston arrangement 8, can be swivelled in a vertical plane about a transverse shaft 9 situated at the free end of the main frame 4, one end of the two hydraulic cylinder piston arrangements [lacuna]. <IMAGE>
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