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Application filed by Ю. А. Шел кин и И. П. ТормозовfiledCriticalЮ. А. Шел кин и И. П. Тормозов
Priority to SU731976338ApriorityCriticalpatent/SU682227A1/en
Application grantedgrantedCritical
Publication of SU682227A1publicationCriticalpatent/SU682227A1/en