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.В. Кудрявцев, вцев Е.В. КудрfiledCriticalЕ.В. Кудрявцев
Priority to SU257ApriorityCriticalpatent/SU69327A1/en
Application grantedgrantedCritical
Publication of SU69327A1publicationCriticalpatent/SU69327A1/en