| 摘要 |
PCT No. PCT/GB93/02411 Sec. 371 Date Aug. 29, 1994 Sec. 102(e) Date Aug. 29, 1994 PCT Filed Nov. 23, 1993 PCT Pub. No. WO94/12010 PCT Pub. Date Jun. 9, 1994The invention concerns an apparatus which is both land and roadworthy and which is for use in land management. The apparatus comprises wheel or drum members on which it travels which members are provided with friction free or self-cleaning ridges which when travelling over land provide an impression of a kind which safeguards against soil erosion and improves land irrigation.
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