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 П.К. АлександровfiledCriticalП.К. Александров
Priority to SU2361ApriorityCriticalpatent/SU75277A1/en
Application grantedgrantedCritical
Publication of SU75277A1publicationCriticalpatent/SU75277A1/en