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Publication date
Publication of SU54782A1publicationCriticalpatent/SU54782A1/en
Application filed by А.А. АвербухfiledCriticalА.А. Авербух
Priority to SU125ApriorityCriticalpatent/SU69569A2/en
Priority claimed from SU125Aexternal-prioritypatent/SU69569A2/en
Application grantedgrantedCritical
Publication of SU69569A2publicationCriticalpatent/SU69569A2/en