claim: Brown University's main campus has been located in the College Hill Historic District of Providence since 1912.
evidence: A chain gun is a type of machine gun or autocannon that uses an external source of power to cycle the weapon rather than diverting energy from the cartridge , and does so via a continuous loop of chain similar to that used on a motorcycle or bicycle .. machine gun. machine gun. autocannon. autocannon. `` Chain gun '' is a registered trademark of Orbital ATK for `` externally-powered machine guns '' .. Orbital ATK. Orbital ATK