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Application filed by М.Ф. Ляпунов, пунов М.Ф. ЛfiledCriticalМ.Ф. Ляпунов
Priority to SU384293ApriorityCriticalpatent/SU75514A1/ru
Application grantedgrantedCritical
Publication of SU75514A1publicationCriticalpatent/SU75514A1/ru