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.)
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Application filed by Л.Г. Берг, П.П. Будников, С.А. КржеминскийfiledCriticalЛ.Г. Берг
Priority to SU380166ApriorityCriticalpatent/SU78298A1/ru
Application grantedgrantedCritical
Publication of SU78298A1publicationCriticalpatent/SU78298A1/ru