. . "1925-01-27Z"^^ . . . . . "Keith, Nathaniel S."@en . . . "Nathaniel Shepard Keith (July 14, 1838 \u2013 January 27, 1925) was an American manufacturer, chemist, inventor, writer, and electrical engineer. Keith was born in Boston, Massachusetts and worked in his fathers laboratory. He was instrumental in designing, manufacturing, and installing the original electric lighting and power system in San Francisco, California."@en . . . "American chemist" . . "1925Z"^^ . "1838-07-14Z"^^ . . "Nathaniel Shepard Keith"@en . "1838Z"^^ . . .