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Application filed by Krum K Cvetkov, Tonco P Tonev, Michail G Mintov, Ivan D Dusanov, Petko A FilipovfiledCriticalKrum K Cvetkov
Priority to CS813574ApriorityCriticalpatent/CS244508B1/en
Publication of CS357481A1publicationCriticalpatent/CS357481A1/en
Publication of CS244508B1publicationCriticalpatent/CS244508B1/en