Минский Проектно-Конструкторский Технологический Институт
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Curing Cements, Concrete, And Artificial Stone
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1.Авторское свидетельство № 142381, В 22с 15/24, 1961.1. The author's certificate number 142381, B 22c 15/24, 1961.2.Авторское свидетельство N° 299284, В 22с 15/24, 1970.2. Author's certificate N ° 299284, B 22c 15/24, 1970.