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.)
Filing date
Publication date
Application filed by П.А. ОрловскийfiledCriticalП.А. Орловский
Application grantedgrantedCritical
Publication of SU2217A1publicationCriticalpatent/SU2217A1/ru