A slide projector having a projector frame and a light source and lens assembly mounted on the frame which includes a cassette having a plurality of slide frame receptacles for receiving slide frames therein. The cassette is movable so as to bring selected slide frames into a dispensing position. A frame...http://www.google.com.au/patents/US4974959?utm_source=gb-gplus-sharePatent US4974959 - Slide projector
