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Prof. A. Graham Bell's induction-balance for ascertaining the location of a bullet in a human body / from a sketch by William A. Skinkle. | Library of Congress
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The Nature of Invention 🔬 on Twitter: "Obscure #invention #Trivia: 🇨🇦Alexander Graham Bell created the 1st practical metal detector. He did so to help doctors find a bullet shot into President James
Prof. A. Graham Bell's induction-balance for ascertaining the location of a bullet in a human body - from a sketch by William A. Skinkle Stock Photo - Alamy
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