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DE710954C
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Process for cleaning gas mixtures containing air or oxygen
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DE555771C
|
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Device for heating sludge digestion tanks
|
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DE571565C
|
|
Device for the ventilation of liquids, in particular waste water
|
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DE544053C
|
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Protective cover for sewage basins
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DE553259C
|
|
Device for the eddy-free distribution of a liquid flowing into a basin
|
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DE571566C
|
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Flat basin clarifier
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DE536259C
|
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Device for skimming floating debris from sewage basins
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DE557238C
|
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Wastewater treatment plant
|
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DE532635C
|
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Immersion body with ventilation pipes
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DE528793C
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Process for purifying waste water
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DE448279C
|
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Process for artificial ventilation of containers and bodies used for biological wastewater treatment
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DE437968C
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Device for removing sludge from several flat sludge basins using a mobile suction excavator
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