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Filter for drinking fountain
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Partition wall for the space between nested hollow bodies, especially for well pipes
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Method and device for taking gas or liquid samples from different layers
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Device for treating liquids with gases
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Agent for binding oil present in liquids
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Configuration method for water wells
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Method and apparatus for determining the geohydraulic permeability of a surface through which ground water flows
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Process for circulating groundwater in soil areas with a gradient of the groundwater level
