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Father Roberto Landell de Moura (January 21, 1861 - June 30, 1928), commonly known as Roberto Landell, was a Brazilian Roman Catholic priest and inventor. He is best known for his attempts in the 1880s to develop long-distance audio transmissions device that combined an improved megaphone device and a photophone (using light beams). Landell received patents in Brazil and the United States during the first decade of the 1900s in which he also included designs

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