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.)
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Application filed by Г.С. ПетровfiledCriticalГ.С. Петров
Priority to SU190791ApriorityCriticalpatent/SU50658A1/en
Application grantedgrantedCritical
Publication of SU50658A1publicationCriticalpatent/SU50658A1/en