  In this article, we introduce mixtures of tempered stable subordinators
(TSS). These mixtures define a class of subordinators which generalize tempered
stable subordinators. The main properties like probability density function
(pdf), Levy density, moments, governing Fokker-Planck-Kolmogorov (FPK) type
equations, asymptotic form of potential density and asymptotic form of the
renewal function for the corresponding inverse subordinator are discussed. We
also generalize these results to n-th order mixtures of TSS.
