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We summarize the current top quark mass ($m_t$) measurements from the CDF andD0 experiments at Fermilab. We combine published results from Run I(1992--1996) with the most precise published and preliminary Run II(2001--2011) measurements based on $p\bar{p}$ data corresponding to up to$9.7\:{\rm fb}^{-1}$ of $p\bar{p}$ collisions. Taking correlations ofuncertainties into account, and combining the statistical and systematiccontributions in quadrature, the preliminary Tevatron average mass value forthe top quark is $m_t = 174.30 \ \pm 0.65\:\mathrm{GeV}/c^{2}$, correspondingto a relative precision of $0.37\%$

Combination of CDF and D0 results on the mass of the top quark using up $9.7\:{\rm fb}^{-1}$ at the Tevatron