Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Encho D Dichev, Ivan A KojjnovfiledCriticalEncho D Dichev
Priority to BG8208487ApriorityCriticalpatent/BG44722A1/xx
Publication of BG44722A1publicationCriticalpatent/BG44722A1/xx