slide projector → προβολέας διαφανειών (http://thumbs.dreamstime.com/z/slide-projector-28673945.jpg) overhead projector → διασκόπιο (overhead projector - definition of overhead projector by The Free Dictionary)opaque (overhead) projector, episcope → επισκόπιο (Opaque projector dictionary definition | opaque projector defined)epidiascope → επιδιασκόπιο (epidiascope: definition of epidiascope in Oxford dictionary (British & World English))data projector → ηλεκτρονικός προβολέας (What Is a Data Projector? | eHow)