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Edison helped design the kinetoscope, a precursor to the modern motion picture projector. It worked through a phenomenon known as "persistence of vision," in which a sequence of images is blended by the eye to create the illusion of motion. Because the work of so many others had gone into its invention, Edison never bothered to apply for an international copyright on the device, believing that it would not stand up in European courts. What effect did this have on the development of cinema?