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Application filed by Werner Schrader, Rudolf Obst, Helmut KommernitzkyfiledCriticalWerner Schrader
Priority to DD20306078ApriorityCriticalpatent/DD133745B1/de
Publication of DD133745A1publicationCriticalpatent/DD133745A1/de
Publication of DD133745B1publicationCriticalpatent/DD133745B1/de