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 Г.А. ВилькеfiledCriticalГ.А. Вильке
Priority to SU4401ApriorityCriticalpatent/SU74219A1/en
Application grantedgrantedCritical
Publication of SU74219A1publicationCriticalpatent/SU74219A1/en