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1.Авторское свидетельство СССР № 481336, кл. В 07 С 5/30, 1973.1. USSR author's certificate number 481336, cl. B 07 C 5/30, 1973.2.Авторское свидетельство СССР № 477793, кл. В 23 D 25/16, 1973.2. USSR author's certificate number 477793, cl. In 23 D 25/16, 1973.пP