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 Я.С. ТкачfiledCriticalЯ.С. Ткач
Priority to SU337ApriorityCriticalpatent/SU72433A1/en
Application grantedgrantedCritical
Publication of SU72433A1publicationCriticalpatent/SU72433A1/en