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Application filed by Е.В. Каныгина, Г.С. ПетровfiledCriticalЕ.В. Каныгина
Priority to SU179874ApriorityCriticalpatent/SU50661A1/ru
Application grantedgrantedCritical
Publication of SU50661A1publicationCriticalpatent/SU50661A1/ru