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Application filed by Е.И. Вайль, Б.Ю. ЯсницкийfiledCriticalЕ.И. Вайль
Priority to SU5369ApriorityCriticalpatent/SU69720A1/en
Application grantedgrantedCritical
Publication of SU69720A1publicationCriticalpatent/SU69720A1/en