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 И.В. КоробовfiledCriticalИ.В. Коробов
Priority to SU145758ApriorityCriticalpatent/SU40756A1/en
Application grantedgrantedCritical
Publication of SU40756A1publicationCriticalpatent/SU40756A1/en