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Year of Publication 23.06.1990
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Year of Publication 30.03.1988
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Year of Publication 07.08.1987
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CORE-TAKER
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Year of Publication 30.11.1990
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Year of Publication 30.11.1990
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CORE RECEIVER
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Year of Publication 23.12.1988
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Year of Publication 23.12.1988
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