BG45301
KAFEDZHIJJSKI,STEFAN K.,BG, T'RPANOV,VELICHKO I.,BG, VLAKHOV,JJONCHO R.,BG, VLAKHOV,RADOSLAV JJ.,BG, LOZANOV,VALENTIN S.,BG, DIMITROV,BOGOMIL A.,BG
Year of Publication 15.05.1989
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Year of Publication 15.05.1989
Patent