Cinematographic projectors; LCD projectors used to display advertisements; Liquid crystal display (LCD) projectors; Movie projectors; Multimedia projectors; Photographic projectors; Picture projectors; Slide projectors; Video projectors; Projection screens; Television receivers; Loudspeakers; Audio-video receivers; Power amplifiers; Slide or photograph projection apparatus; Cinematographic machines and apparatus; Transmitters and receivers for audio and video signals for transmission over twi...