Members of the Andhra Pradesh United Teachers' Federation on Sunday staged a lunch-hour demonstration demanding full salaries to the 2008 DSC teachers, during the training classes for teachers at Patamata, in Vijayawada. B. Nageswara Rao, general secretary, said the demonstrators also demanded scrapping of the apprentice system of appointments. They called for a united struggle to force the Government to drop the apprentice policy while implementing the PRC scales.