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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 О. А. Бойцов , И. И. ЖилевичfiledCriticalО. А. Бойцов , И. И. Жилевич
Priority to SU1814559ApriorityCriticalpatent/SU429379A1/ru
Application grantedgrantedCritical
Publication of SU429379A1publicationCriticalpatent/SU429379A1/ru