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Application filed by Petkov, Minkov, Petkova, PapazovfiledCriticalPetkov
Priority to BG94176ApriorityCriticalpatent/BG61232B1/en
Publication of BG94176ApublicationCriticalpatent/BG94176A/en
Publication of BG61232B1publicationCriticalpatent/BG61232B1/en