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 Е.А. ИвановаfiledCriticalЕ.А. Иванова
Priority to SU0759ApriorityCriticalpatent/SU71640A1/en
Application grantedgrantedCritical
Publication of SU71640A1publicationCriticalpatent/SU71640A1/en