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Application filed by Kopalnia Wegla Kamiennego NiwkfiledCriticalKopalnia Wegla Kamiennego Niwk
Priority to PL19251876ApriorityCriticalpatent/PL109396B1/pl
Publication of PL192518A1publicationCriticalpatent/PL192518A1/pl
Publication of PL109396B1publicationCriticalpatent/PL109396B1/pl