We report the results of the CPLEAR experiment on CP-, T- and
CPT-symmetries in the neutral kaon system. CP-violation parameters are
given for different decay channels. For the first time T-violation is
measured by a direct method using semileptonic decays. The CPT symmetry
in the kaons decays is tested through the parameters Im(delta), from the
Bell-Steinberger relation, with a precision. of 10(-5) and Re(delta)
with a precision of a. few 10(-4) (two order of magnitude better than
the previous measurement). These two measurements allow us to bound the
difference in mass and width of K-0 and (K) over bar(0) It to be equal
within 10(-18) GeV. In the limit of CPT invariance in the neutral kaon
decays, the K-0 and (K) over bar(0) masses are equal within 10(-19) GeV
