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BARBIER SOC
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BARBIER SOC
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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
H04B10/50—Transmitters
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FR423878D1910-12-201910-12-20
Occultation device intended for lanterns used for optical telegraphy
ExpiredFR423878A
(en)