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Application filed by Л. Н. Андреев , М. М. Кравеи КравчевскаfiledCriticalЛ. Н. Андреев , М. М. Кравеи Кравчевска
Priority to SU1811332ApriorityCriticalpatent/SU428343A1/ru
Application grantedgrantedCritical
Publication of SU428343A1publicationCriticalpatent/SU428343A1/ru