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Application filed by Karel Blesik, Josef Smisek, Antonin TrnkafiledCriticalKarel Blesik
Priority to CS862718ApriorityCriticalpatent/CS257966B1/en
Publication of CS271886A1publicationCriticalpatent/CS271886A1/en
Publication of CS257966B1publicationCriticalpatent/CS257966B1/en