A survey is given of the experimental tandem mirror results obtained at the University of Tsukuba since 1978. The first tandem mirror, GAMMA 6, demonstrated the tandem mirror potential configuration and the validity of the Pastukhov confinement scaling law. GAMMA 10 demonstrated the plug/thermal-barrier potential distribution in axisymmetric end mirrors. The Pastukhov scaling for axial confinement was confirmed and improved radial confinement was observed, indicating the benefit of an axisymmetrized magnetic-field configuration.