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1.
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[Place of publication not identified] : [publisher not identified], 1967.
German | R 71 WEN.R |
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2.
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Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1972.
German | 28 DE |
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3.
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Cologne [Germany] : German Association for the Protection of Intellectual Property (GRUR), 1991.
German | 28 DE |
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