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Application filed by Л.Г. Лейтес, П.А. ТрубицынfiledCriticalЛ.Г. Лейтес
Priority to SU1129ApriorityCriticalpatent/SU71637A1/en
Application grantedgrantedCritical
Publication of SU71637A1publicationCriticalpatent/SU71637A1/en