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stabilizer of organic polymeric materials through the use of synergistic mixtures consisting of cyclic amines stericamente prevented and derivatives of 3 - pirazolidinone or 1,2,4, triazolidin - 35 - dione
stabilizer of organic polymeric materials through the use of synergistic mixtures consisting of cyclic amines stericamente prevented and derivatives of 3 - pirazolidinone or 1,2,4, triazolidin - 35 - dione