The history of discovering of the heaviest elementary particle - top-quark with CDF experiment at the tevatron collider in 1995 is stated. Main production channels and methods of top-quark mass measurement are described. The importance and strategics of the top-quark mass measurement in different decay channels of t pair at proton-proton collider LHC with = 14 TeV, whose operation is expected to start in the nearest future, are discussed. Also, investigations in the early period of collider operation are described.

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