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Application grantedgrantedCritical
Publication of SU10368A1publicationCriticalpatent/SU10368A1/en
Application filed by М.М. Звягин, гин М.М. ЗвfiledCriticalМ.М. Звягин
Priority to SU3008ApriorityCriticalpatent/SU69264A1/en
Priority claimed from SU3008Aexternal-prioritypatent/SU69264A1/en
Publication of SU69264A1publicationCriticalpatent/SU69264A1/en