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Application filed by В.П. Шишков, М.Ф. ШостаковскийfiledCriticalВ.П. Шишков
Priority to SU394631ApriorityCriticalpatent/SU77418A1/en
Application grantedgrantedCritical
Publication of SU77418A1publicationCriticalpatent/SU77418A1/en