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Application filed by Л. В. Смирнов, Бюро технической помощи ордена Трудового Красного, Знамени главного ленинградского унравлени, автомобильного транспортаfiledCriticalЛ. В. Смирнов
Priority to SU1725653ApriorityCriticalpatent/SU426892A1/ru
Application grantedgrantedCritical
Publication of SU426892A1publicationCriticalpatent/SU426892A1/ru