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Year of Publication 07.08.1990
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Year of Publication 23.04.1990
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Year of Publication 15.01.1990
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Year of Publication 30.12.1989
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EXPANDER FOR DRILLING ASCENDING HOLES
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Year of Publication 23.11.1989
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Year of Publication 23.11.1989
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Year of Publication 15.10.1989
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Year of Publication 30.09.1989
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Year of Publication 30.09.1989
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Year of Publication 15.08.1989
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Year of Publication 15.08.1989
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Year of Publication 07.07.1989
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Year of Publication 07.07.1989
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Year of Publication 15.04.1989
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Year of Publication 15.04.1989
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EXPANDER FOR DRILLING ASCENDING WELLS
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Year of Publication 23.01.1989
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Year of Publication 23.01.1989
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Year of Publication 23.06.1991
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Year of Publication 23.06.1991
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Year of Publication 23.07.1990
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Year of Publication 23.07.1990
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Year of Publication 30.03.1990
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Year of Publication 23.11.1989
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Year of Publication 23.11.1989
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