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Application filed by В. И. Иванов и Ю. П. КонюховfiledCriticalВ. И. Иванов и Ю. П. Конюхов
Priority to SU782612988ApriorityCriticalpatent/SU688595A1/en
Application grantedgrantedCritical
Publication of SU688595A1publicationCriticalpatent/SU688595A1/en