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Application filed by Н.Н. Ворожков, П.Н. КулаковfiledCriticalН.Н. Ворожков
Priority to SU385846ApriorityCriticalpatent/SU76843A1/en
Application grantedgrantedCritical
Publication of SU76843A1publicationCriticalpatent/SU76843A1/en