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 А.С. ЧасовниковfiledCriticalА.С. Часовников
Priority to SU442ApriorityCriticalpatent/SU77556A1/ru
Application grantedgrantedCritical
Publication of SU77556A1publicationCriticalpatent/SU77556A1/ru