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Application filed by Г.Н. Милованов, Г.Ф. СилинаfiledCriticalГ.Н. Милованов
Priority to SU168019ApriorityCriticalpatent/SU42679A1/ru
Application grantedgrantedCritical
Publication of SU42679A1publicationCriticalpatent/SU42679A1/ru