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Application filed by Ivan G Penkov, Ivan S Gucov, Ivan R Petkov, Emil P Popov, Khristo I Rajjkov, Chvarov Georgi A BfiledCriticalIvan G Penkov
Priority to BG7668186ApriorityCriticalpatent/BG42738A1/en
Publication of BG42738A1publicationCriticalpatent/BG42738A1/en