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 Ф.В. Максимов, Д.А. ШапошниковfiledCriticalФ.В. Максимов
Priority to SU186-47ApriorityCriticalpatent/SU74071A2/en
Application grantedgrantedCritical
Publication of SU74071A2publicationCriticalpatent/SU74071A2/en