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
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Application filed by Н.В. ПетровfiledCriticalН.В. Петров
Priority to SU177787ApriorityCriticalpatent/SU48938A1/ru
Application grantedgrantedCritical
Publication of SU48938A1publicationCriticalpatent/SU48938A1/ru