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Application filed by В.А. Брагин, А.М. Григорян, н А.М. Григор, К.А. ЦаревичfiledCriticalВ.А. Брагин
Priority to SU394721DpriorityCriticalpatent/SU78747A2/ru
Application grantedgrantedCritical
Publication of SU78747A2publicationCriticalpatent/SU78747A2/ru