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The U.S. Patent and Trademark Office building in Alexandria, Va., has a contemporary look, but Senators trying to update the patent system say it's stuck in the 1950s and needs to catch up with 21st-century technology. A bipartisan bill to reform the system is headed for Senate debate. (Associated Press)

The U.S. Patent and Trademark Office building in Alexandria, Va., has a contemporary look, but Senators trying to update the patent system say it's stuck in the 1950s and needs to catch up with 21st-century technology. A bipartisan bill to reform the system is headed for Senate debate. (Associated Press)

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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.