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.П. МатиссенfiledCriticalП.П. Матиссен
Priority to SU169001ApriorityCriticalpatent/SU49017A1/ru
Application grantedgrantedCritical
Publication of SU49017A1publicationCriticalpatent/SU49017A1/ru