DE: Patentschrift: Dr. John H. Smith, Photographische Aufnahme-Platte mit drei lichtempfindlichen Schichten für die Dreifarben-Photographie, 26.08.1903, Patent Nr. 29446
EN: Patent specification: Dr. John H. Smith, Photographic recording plate with three light-sensitive layers for three-color photography, Aug. 26, 1903, Patent No. 29446.

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