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Application filed by Helmut Kratzsch, Erdmann Dipl Ing Puls, Lothar Tschatzki, Reinhard Blumenthal, Gerold Lux, Heinz VoigtfiledCriticalHelmut Kratzsch
Publication of CS762882A1publicationCriticalpatent/CS762882A1/en
Publication of CS245277B1publicationCriticalpatent/CS245277B1/en