BG45088
S'BEV,S'BI G.,BG, JJONCHEV,BORISLAV A.,BG, DJAKOV,TODOR G.,BG, MINEV,STOJAN B.,BG, KHRISTOVA,PETJA N.,BG, EVTIMOV,RUMEN N.,BG
Year of Publication 14.04.1989
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Year of Publication 14.04.1989
Patent