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Application filed by Ivanov, Khristov, Velichkov, TachevfiledCriticalIvanov
Priority to BG8152682ApriorityCriticalpatent/BG32402A1/en
Priority to CS485382Aprioritypatent/CS245739B1/en
Priority to SU827772528Aprioritypatent/SU1112578A1/en
Publication of BG32402A1publicationCriticalpatent/BG32402A1/en