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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
H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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FR971884D1940-03-231940-03-23Dispositif d'élimination de perturbations dans la réception en photo-téléphonie ou photo-télégraphie
ExpiredFR971884A
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