Progressively keyed electrical musical instrument

作者: Jr Melville Clark

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参考文章(11)
John M Hanert, Electrical musical instrument ,(1939)
Spielmann Emerich, Electric music instrument ,(1928)
Emeric M Spielman, Photoelectric keyboard instrument ,(1947)
Ranger Richard Howland, Apparatus for producing musical sounds ,(1931)
Raymond C Fisher, Photoelectric musical instrument ,(1936)
Melvin L Severy, Sound-producing device. ,(1913)
Richard E Williams, Electronic tone generator ,(1948)