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Application filed by Kopalnia Wegla Kamiennego PowsfiledCriticalKopalnia Wegla Kamiennego Pows
Priority to PL23561582ApriorityCriticalpatent/PL135480B1/en
Publication of PL235615A1publicationCriticalpatent/PL235615A1/en
Publication of PL135480B1publicationCriticalpatent/PL135480B1/en