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1973-07-31
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1978-08-01
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1977-08-09
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1975-12-30
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1973-12-18
Treatment of sewage sludge
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Method and apparatus for liquid waste disposal
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1971-02-04
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Method and device for the purification of sewage
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1971-02-04
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1970-11-10
Method and equipment for activated sludge processing of sewage
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1975-04-08
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1967-07-11
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1969-08-05
Sewage treatment including sludge disposal through digestion
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1969-09-16
Method for disposal of waste solids
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1973-12-18
Process and apparatus for the biological purification of waste waters
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1972-02-10
Solid waste disposal and water purification method and apparatus
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1969-01-14
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1973-03-02
Treatment of liquid waste effluent
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1975-03-11
Method and apparatus for disposal of liquid waste