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.Д. Барыкин, П.Г. БелогорцевfiledCriticalФ.Д. Барыкин
Priority to SU136933ApriorityCriticalpatent/SU42125A1/en
Application grantedgrantedCritical
Publication of SU42125A1publicationCriticalpatent/SU42125A1/en