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PL287268A1
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Method for sealing sandy soil
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PL269907A1
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Apparatus for protecting hydrophore tanks against escape of compressed air
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PL268957A1
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Underground water treatment plant
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PL254817A1
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Counter-tie structure for stabilizing supports in multispan bridges
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PL254816A1
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Strouting structure for stabilization of supports in single-span bridges
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PL249525A1
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Apparatus for treating water and maintaining desired pressure therefor
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PL243552A1
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Apparatus for making watertight shields in water plants
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PL242008A1
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Method of sealing pipes in particular lage diameter ones and annular seal retainer therefor
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PL241881A1
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Apparatus for automatically positioning a weir flap
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PL241426A1
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Method of construction of bridge without bridge abutment and structure of bridge pier therefor
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PL241109A1
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Overflow apparatus for water reservoir dams
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PL241108A1
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Apparatus for building watertight walls used in earthen structures
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PL235638A2
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Method of and system for controlling pumping units at waterworks' water intake stations
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