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.С. Петров, С.В. ШишкинfiledCriticalГ.С. Петров
Priority to SU191226ApriorityCriticalpatent/SU49224A1/ru
Application grantedgrantedCritical
Publication of SU49224A1publicationCriticalpatent/SU49224A1/ru