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Lewis Howard Latimer invented a "water closet" for railroad cars in 1873 and drafted the patent drawings for Alexander Graham Bell's first telephone. In 1881, Latimer devised a method for making a carbon filament for a light bulb made by one of Thomas Edison's competitors, and then supervised that firm's installation of electric lights in New York City, Philadelphia, Montreal and London  http://www.biography.com/people/lewis-howard-latimer-9374422