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Application filed by Helmut Fiedler, Alfred Hartmann, Josef Turek, Herwig HabelfiledCriticalHelmut Fiedler
Priority to DD15790871ApriorityCriticalpatent/DD98539B1/xx
Publication of DD98534A1publicationCriticalpatent/DD98534A1/xx
Publication of DD98539B1publicationCriticalpatent/DD98539B1/xx