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 Е.Х. ГельгренfiledCriticalЕ.Х. Гельгрен
Priority to SU154696ApriorityCriticalpatent/SU44023A1/ru
Application grantedgrantedCritical
Publication of SU44023A1publicationCriticalpatent/SU44023A1/ru