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Application filed by Ф.Ф. Гулякин, кин Ф.Ф. ГулfiledCriticalФ.Ф. Гулякин
Priority to SU31309ApriorityCriticalpatent/SU27749A1/en
Application grantedgrantedCritical
Publication of SU27749A1publicationCriticalpatent/SU27749A1/en