Abstract: A delimbing apparatus for the delimbing of trees, which can be connected to a moving vehicle via a boom system. The apparatus includes a frame part and a delimbing head. The frame part is provided with gripping elements, by which the frame part is fastened against the trunk of the tree at a desired height during delimbing work. The apparatus includes a delimbing head which is separate from the frame part and is provided with a gripping device for gripping the trunk of the tree. The delimbing head is moved by drive means along the tree trunk, and at least one delimbing cutter and a feed and control cable for transmitting operating power, connected between the delimbing head moving along the trunk of the tree and the frame part.

Abstract: A method for cleaning a water area including dredging, via a dredging apparatus, waste from the water area through a suction pipe into a sedimentation basin, generating a flow of the dredged waste from the water area to the sedimentation basin via siphonage and variations in heights of the suction pipe relative to a bottom of the water area, and converting energy caused by the flow of the dredged waste in the suction pipe into energy for driving the dredging apparatus.

Abstract: A delimbing apparatus for the delimbing of trees, which can be connected to a moving vehicle via a boom system, said apparatus comprising a frame part (3) and a delimbing head (4). The frame part (3) is provided with gripping elements (15), by means of which it is fastened against the trunk of the tree at a desired height for the time of the delimbing work. The apparatus comprises a delimbing head (4) which is separate from the frame part and is provided with a gripping device (12) by means of which it grips the trunk of the tree and is moved by drive means (13) along the tree trunk, and at least one delimbing cutter (11) and a feed and control cable (10) for transmitting operating power, connected between teh delimbing head (4) moving along the trunk of the tree and the frame part (3).

Abstract: Method and apparatus for cleaning a water area, such as a lake, pond, river or a similar water basin, wherein the water basin is provided with a suction pipe system (4) arranged in connection with the lake (1), pond or equivalent and connected to a dredging apparatus working under water, by means of which the sludge or similar waste produced or at least part of it is passed into a suction pipe (4) and through it further into a sedimentation basin (8), where the flow is retarded so that, as it advances through the basin, extra humus and sludge material is separated from it via sedimentation, and that the water thus purified is passed back into the water area, e.g. into an inflow ditch.