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Application filed by Lettke Hans Joachim, Manfred PrescherfiledCriticalLettke Hans Joachim
Priority to DD19741477ApriorityCriticalpatent/DD130194B1/de
Publication of DD130194A1publicationCriticalpatent/DD130194A1/de
Publication of DD130194B1publicationCriticalpatent/DD130194B1/de