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Application filed by В. Н. Пирогов, А. А. Кал гин , М. КазакевичfiledCriticalВ. Н. Пирогов, А. А. Кал гин , М. Казакевич
Priority to SU1947401ApriorityCriticalpatent/SU453458A1/ru
Application grantedgrantedCritical
Publication of SU453458A1publicationCriticalpatent/SU453458A1/ru