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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
First attempt to Locate a Bullet without Surgery: An Application of Electromagnetism to 19 Century Medicine
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US 4,300,097 A - Induction balance metal detector with ferrous and non-ferrous metal identification | RPX Insight
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