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electronic audio and/or audio-visual stereo processor apparatus for use in cinemas; audio-visual systems for cinemas containing a sound processor and a projector for displaying a motion picture film; motion picture projectors and associated stereo processing apparatus; professional; and amateur electronic sound enhancing apparatus; amplifiers; stereo processors for use in cinemas; video disc playback and/or recording apparatus; home audio-visual recording apparatus; televisions; laser disc players and recorders; VCRs; digital video tape players; audio and/or audio-visual recordings stored on magnetic tape or optical media; audio and/or audio-visual prerecorded media containing entertainment material, namely motion picture film and VCR cassette tapes; audio and/or audio visual storage media, namely laser discs, video discs, analog or digital audio cassette tapes, analog or digita video cassette tapes for professional or home storage of entertainment material; VCR cassette tapes for storage of entertainment material; motion picture film, and optical disc or magnetic apparatus for storing audio and/or audio-visual recordings containing entertianment material