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H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
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FR1122191D1955-04-011955-04-01Procédé et dispositif pour obtenir un effet stéréophonique en se servant de films sonores normaux
ExpiredFR1122191A
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