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President Obama has placed examples of American inventions on his office shelves, including Samuel F.B. Morse's 1849 patent model of his Electric Telegraph. (Associated Press/Smithsonian Institution)

President Obama has placed examples of American inventions on his office shelves, including Samuel F.B. Morse's 1849 patent model of his Electric Telegraph. (Associated Press/Smithsonian Institution)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.