BG44593
VLASINSKI,IVAN M.,BG, STOJANOV,BOZHAN D.,BG, KONSTANTINOV,MITKO K.,BG, IVANOV,IVAN KH.,BG, BOJADZHIEVA,STEFKA R.,BG, GERDZHIKOV,DIMIT'R G.,BG
Year of Publication 16.01.1989
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Year of Publication 16.01.1989
Patent