Jean Alexandre LeMat
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Dr. Jean Alexandre Francois LeMat (1824–1883), is best known for the percussion cap revolver that bears his name (see LeMat revolver).
LeMat, then a New Orleans physician, secured U.S patent #15925 for his design on October 21, 1856. British patents for the same design were issued in 1859, and he later designed a revolver rifle of similar concept as the handgun.