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H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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FR483874D1913-12-051914-12-05Procédé et appareils pour recevoir et amplifier les signaux télégraphiques
ExpiredFR483874A
(fr)
Fremgangsmaade til Fremstilling af lydgengivende Plader, Baand og lignende samt Fremgangsmaade og Apparat til Lydens Gengivelse ved Hjælp af saadanne Lydplader.