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Application filed by Frantisek Ing Kepak, Jaroslav KankafiledCriticalFrantisek Ing Kepak
Priority to CS841980ApriorityCriticalpatent/CS241724B1/en
Publication of CS198084A1publicationCriticalpatent/CS198084A1/en
Publication of CS241724B1publicationCriticalpatent/CS241724B1/en