English: Schematic representation of the keyboard design of the Fokker organ. Section from one manual. See: [1] for more.
References
Fokker, Adriaan Daniël; tr. Leigh Jardine New Music with 31 Notes, Volume 5 of Orpheus-Schriftenreihe zu Grundfragen der Musik, Bonn: Vertrag fur Systematische Musikwissenschaft GmbH, 1975, pp. 96
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