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Application filed by З.Г. Лаптева, А.И. НаумовfiledCriticalЗ.Г. Лаптева
Priority to SU380228ApriorityCriticalpatent/SU76568A1/en
Application grantedgrantedCritical
Publication of SU76568A1publicationCriticalpatent/SU76568A1/en