The spectra of tin, antimony and tellerium were photographed in the 120-200 Å region on 10.7 m and 3 m grazing incidence spectrographs using a triggered spark source. The 4d⁸-4d⁷(4f + 6p) + 4p⁵4d⁹ transitions of Sn VII, Sb VIII and Te IX were investigated. In the Sn VII spectrum 109 new lines were classified in the 152-192 Å region and 34 new levels were established, in the Sb VIII spectrum 78 new lines were classified in the 138-158 Å region and 21 new levels were established, and in the Te IX 76 new lines were classified in the 121-139 Å region and 21 new levels were established. Strong configuration interaction among the 4d⁷(np + mf), and 4p⁵4d⁹ (n = 5, 6; m = 4, 5) configurations was observed. Least-squaresfitting (LSF) parametric calculations involving configuration interaction were carried out to interpret the observed spectra.