A 3D

stereo televisions, stereo receivers, portable video systems comprised of television sets and video cameras, in-flight entertainment systems comprised of video monitors, video cassette players, headphones, stereo television and loudspeakers, compact home theater systems comprised of video monitors, video cassette players, headphones, stereo televisions and loudspeakers, Digital Video Disc (DVD) players and audio systems which hook up to video monitors, video cassette recorders, set top boxes, namely, receivers for digital modulated TV signals transmitted via satellite or cable, headphone systems comprised of "stereo headphones", and multimedia systems comprised of computers, video game machines for use with televisions and computers and combined computer/television sets