Piano-harp
Piano-harp *electrophonic instr. invented by J. Béthenod by 1932, with electron-tube tone generators (W. Meyer-Eppler: Elektrische Klangerzeugung. Bonn, 1949).
Piano-harp *electrophonic instr. invented by J. Béthenod by 1932, with electron-tube tone generators (W. Meyer-Eppler: Elektrische Klangerzeugung. Bonn, 1949).