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1988-09-14
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1987-08-25
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1984-08-08
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1987-06-04
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1987-10-21
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1987-09-23
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1991-08-13
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1988-03-02
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1988-08-15
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1987-08-19
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1991-03-13
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1990-08-14
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1990-12-13
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1991-03-25
Method for biological purification of waste
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1988-05-30
Process and apparatus for biological cleaning waste waters
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1989-10-12
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1987-02-01
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1987-07-08
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1988-11-10
Apparatus for biological treatment of waste water
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1991-12-17
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1987-10-28
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1989-09-12
Method of waste waters purification or preliminary purification