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 А.А. БетхерfiledCriticalА.А. Бетхер
Priority to SU168432ApriorityCriticalpatent/SU45493A1/en
Application grantedgrantedCritical
Publication of SU45493A1publicationCriticalpatent/SU45493A1/en