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Application filed by Petko C Petrov, Vladimir M Pavlov, Pet R G Antonov, Katinka B Petkova, Kharalambi E Kharalambiev, Marin K DilovskifiledCriticalPetko C Petrov
Priority to BG8217587ApriorityCriticalpatent/BG44726A1/xx
Publication of BG44726A1publicationCriticalpatent/BG44726A1/xx