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Application filed by В. А. Ильин, П. Н. Димитраки, С. Н. ДимитракиfiledCriticalВ. А. Ильин
Priority to SU1826990ApriorityCriticalpatent/SU439902A2/ru
Application grantedgrantedCritical
Publication of SU439902A1publicationCriticalpatent/SU439902A1/ru
Publication of SU439902A2publicationCriticalpatent/SU439902A2/ru