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very rare 3-color camera, format 4.5x13cm, plaque engraved: LE MELANOCHROMOSCOPE Invention de L. DUCOS DU HAURON Appareil pour la Photographie des Couleurs Brevete France-Etranger L. LESUEUR & DUCOS DU HAURON Constructeurs, fixed focus achromatic lens, ground-glass focusing screen and one double plate film holder. This colour separation camera takes three exposures on one plate, it does not use a shutter and may be used as a camera for taking exposures and as a chromoscope for viewing them, extremely rare and in very fine original condition, one of less than ten examples known to exist. Literature: Michel Auer (1990) The Guide to Antique Cameras no 2395