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.И. КолотилинfiledCriticalЕ.И. Колотилин
Priority to SU156348ApriorityCriticalpatent/SU45041A1/en
Application grantedgrantedCritical
Publication of SU45041A1publicationCriticalpatent/SU45041A1/en