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Priority to DE19752542259priorityCriticalpatent/DE2542259C2/de
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Publication of DE2542259A1publicationCriticalpatent/DE2542259A1/de
Publication of DE2542259B1publicationCriticalpatent/DE2542259B1/de
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Publication of DE2542259C2publicationCriticalpatent/DE2542259C2/de
