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Method for recycling household waste incineration residues and ashes from incineration of sludge from urban sewage treatment plants, and mixture obtained by this method
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Trenching apparatus for digging deep trenches
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Target for guidance of tunnelling or other drilling equipment
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Process for purifying groundwater by means of a permeable structure
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Trenching apparatus for digging deep trenches with cutting drums mounted on a chassis
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Method and apparatus for creating thin walls in the ground
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Method for building an underground construction, particularly a vehicle park, while leaving in place obstacles such as trees
