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1991-09-23
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1989-02-20
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1992-12-17
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1995-12-27
Method of processing solid wastes
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1992-11-18
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1990-10-31
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1991-09-30
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1991-02-25
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1989-07-12
Method of pesticides removal from contaminated waters
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1991-04-22
Method of safely disposing sulfurized wastes
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1990-09-15
Method of processing metal waste
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1989-10-18
Method of treating toxic waste
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1989-10-30
The method of recovery of polycarbonates from waste
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1990-11-14
Method of toxic waste quenching salts removal
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1991-10-23
Method for the treatment of a photoconductor
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1989-10-02
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