Tokushichi Mishima

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Tokushichi Mishima
Tokushichi Mishima photographed by Shigeru Tamura.jpg
Born (1893-02-24)February 24, 1893
 Japan Tsuna District, Hyōgo
Died November 19, 1975(1975-11-19) (aged 82)
Nationality Japanese
Fields metallurgy
Institutions Tokyo Imperial University
Alma mater Tokyo Imperial University
Known for MKM steel

Tokushichi Mishima (三島 徳七?, Mishima Tokushichi, February 24, 1893 – November 19, 1975) was a Japanese metallurgist. He discovered that aluminum restored magnetism to non-magnetic nickel steel. He invented MKM steel, which was an extremely inexpensive magnetic substance that has been used in many applications. It is also closely related to the modern Alnico magnets. He later became a professor at the Tokyo Imperial University. After his death, his remains were buried in the Tama Cemetery in Tokyo.


  • Award of the Imperial Academy (1945)
  • Order of Culture (1950)
  • Medal of Honor with Blue Ribbon (1950)
  • Grand Cordon of the Order of the Rising Sun (19 November 1975; posthumous)

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