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Application filed by Б.И. Филиппович, А.П. ШорыгинfiledCriticalБ.И. Филиппович
Priority to SU29786ApriorityCriticalpatent/SU74288A1/ru
Application grantedgrantedCritical
Publication of SU74288A1publicationCriticalpatent/SU74288A1/ru