| 摘要 |
PCT No. PCT/GB94/01324 Sec. 371 Date Aug. 26, 1996 Sec. 102(e) Date Aug. 26, 1996 PCT Filed Jun. 20, 1994 PCT Pub. No. WO95/00713 PCT Pub. Date Jan. 5, 1995The invention relates to a device mountable on a dozer blade for skimming a substance to a required depth, comprising an open box or collector for skimmed material, and a cutting edge of a rear wall which is used to effect skimming. The depth of skim is adjustable by height adjusting means which are described in the specification. A slow sand filter may be cleaned using a device according to the invention.
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