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H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
H04L25/4902—Pulse width modulation; Pulse position modulation
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FR417082D1910-06-131910-06-13Mécanisme d'aiguille pour signaux avertisseurs à distance
ExpiredFR417082A
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