In 1997, the Mateba company developed a type of recoil-operated automatic revolver, the Mateba Unica auto-revolver, which uses recoil energy to auto-rotate a revolver cylinder holding 6 or 7 cartridges, depending on the model.
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Presidential assassin Leon Czolgosz shot and wounded U.S. President William McKinley in Buffalo, New York on September 6, 1901 with an Iver Johnson .32 caliber Safety Automatic revolver (serial number 463344).