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GB1369679A
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Surface aeration of liquids
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GB1378489A
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Sludge disposal
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GB1363416A
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Biological filtration apparatus
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GB1333061A
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Biological treatment of waste water containing organic matter
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GB1324358A
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Apparatus for the biological treatment of waste water by the biosorption process
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ES374372A1
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Apparatus for surface aeration of the liquid contained in a deposit. (Machine-translation by Google Translate, not legally binding)
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GB1321603A
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Treatment of liquid suspensions
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ES348264A1
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A surface aeration apparatus. (Machine-translation by Google Translate, not legally binding)
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