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 В.В. Лилиенфельд, Б.В. СтепановfiledCriticalВ.В. Лилиенфельд
Priority to SU32500ApriorityCriticalpatent/SU19028A1/en
Application grantedgrantedCritical
Publication of SU19028A1publicationCriticalpatent/SU19028A1/en