Ленинградский Ордена Трудового Красного Знамени Технологический Институт Им.Ленсовета
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1.Авторское свидетельство СССР М 399490, М. кл. С 04 В 41/14, 1971.1. Authors certificate USSR M 399490, M. class. From 04 To 41/14, 1971.2.Авторское свидетельство СССР I 514797, М. кл. С 04 В 41/14. 1974.2. Authors certificate of the USSR I 514797, M. class. From 04 to 41/14. 1974.