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Application filed by Willi Jahr, Pinternagel Ernst Karl, Ehler Fritzsche, Gralla Hans Joachim, Eberhard Liesk, Ulrich SteinerfiledCriticalWilli Jahr
Priority to DD19577576ApriorityCriticalpatent/DD129819A1/de
Publication of DD129819A1publicationCriticalpatent/DD129819A1/de