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1986-03-07
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1986-11-06
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1989-11-06
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1983-02-22
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1990-04-09
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1984-09-24
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1982-11-12
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1991-09-09
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1983-08-09
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1985-04-30
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1988-07-27
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1983-12-13
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1983-04-06
METHOD AND APPARATUS FOR LOCATION OF UNDERGROUND PIPE PIPES LIKE DRAIN PIPES
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1983-12-27
METHOD AND APPARATUS FOR THE MANUFACTURE OF FLEXIBLE PIPE HOSE
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1986-10-10
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1983-04-28
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1983-06-29
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1984-10-11
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1988-06-30
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1983-07-19
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1985-04-21
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1986-01-31
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1988-07-18
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