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1999-05-28
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1993-03-17
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1993-02-24
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1989-04-13
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1986-03-26
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1991-08-28
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1993-09-28
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1990-08-29
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1993-10-28
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1991-12-30
Covering material and process for its production
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1995-03-28
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1992-07-16
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1991-07-16
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1993-03-03
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1991-12-27
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1992-03-18
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1991-10-28
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1990-03-28
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1991-12-27
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1991-09-04
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1993-05-30
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1991-02-27
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1998-02-25
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