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Priority to IT1900779ApriorityCriticalpatent/IT1109934B/en
Publication of IT7919007A0publicationCriticalpatent/IT7919007A0/en
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Publication of IT1109934BpublicationCriticalpatent/IT1109934B/en
IT1900779A1979-01-021979-01-02Two-zone activated sludge tank to purify waste water - offers high efficiency treatment by repeated inter-zone transfer for intermittent aeration
IT1109934B
(en)