Inventor of the eponymous machine gun which has been estimated to have killed over 250,000 men since 1862. Rare ALS signed 'R. B. Gatling,' one lightly-lined page, 8.5 x 11, Office of the Gatling Gun Company letterhead, October 6, 1884. Gatling writes to the Colt Firearms Factory. In full, 'We have a gun, tripod and c. at the New Haven Museum, and understand that the exhibition is to be broken up. Will you kindly have the gun and c. brought to the Armory with your exhibit.' In fine condition, with intersecting mailing folds, some light feathering to bold signature and some light edge toning and soiling. COA John Reznikoff/PSA/DNA and RRAuction COA.