120years.net
The Electrophon (1921), Sphäraphon(1924), kurbelsphärophon (1926), Klaviatursphäraphon(1928), Partiturophon (1930) and Kaleidophon(1939). Jörg Mager, Germany.
“Whoever has occupied himself even a little with electric sounds will be forced to the conclusion: there are yet things in music of which our book-learning cannot dream.” Jörg Mager Jörg Mager&#82…