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Mid to late 19th c.
Named after German-born instrument maker, Heinrich Rühmkorff for use with induction coils. Although the induction coil was invented in 1936 by Nicholas Callan, it was Rühmkorff who managed to popularize it in 1951 through use of commutator with the induction coil. It was only in 1989 that Callan’s invention was recognized.