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 Ф.А. ФофановfiledCriticalФ.А. Фофанов
Priority to SU119645ApriorityCriticalpatent/SU33645A1/ru
Application grantedgrantedCritical
Publication of SU33645A1publicationCriticalpatent/SU33645A1/ru