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 З.А. Гольдберг, Б.И. КочетковfiledCriticalЗ.А. Гольдберг
Priority to SU1861ApriorityCriticalpatent/SU70969A1/ru
Application grantedgrantedCritical
Publication of SU70969A1publicationCriticalpatent/SU70969A1/ru