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 Л.В. Зильперт, П.Ф. СапилевскийfiledCriticalЛ.В. Зильперт
Priority to SU11202ApriorityCriticalpatent/SU76844A1/en
Application grantedgrantedCritical
Publication of SU76844A1publicationCriticalpatent/SU76844A1/en