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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Publication date
Application filed by В.Ф. РатановаfiledCriticalВ.Ф. Ратанова
Priority to SU962ApriorityCriticalpatent/SU75189A1/en
Application grantedgrantedCritical
Publication of SU75189A1publicationCriticalpatent/SU75189A1/en