Adriaan Fokker

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Wikipedia: Adriaan Daniël Fokker (Dutch pronunciation: [ˈaːdriaːn ˈdaːniɛl ˈfɔkər]; 17 August 1887 – 24 September 1972) was a Dutch physicist and musician. He was the inventor of the Fokker organ, a 31-tone equal-tempered (31-TET) organ.