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 Р.А. ГакельfiledCriticalР.А. Гакель
Priority to SU2909ApriorityCriticalpatent/SU73786A1/en
Application grantedgrantedCritical
Publication of SU73786A1publicationCriticalpatent/SU73786A1/en