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.А. КоганfiledCriticalЕ.А. Коган
Priority to SU??-3778ApriorityCriticalpatent/SU51956A1/en
Application grantedgrantedCritical
Publication of SU51956A1publicationCriticalpatent/SU51956A1/en