Assertion: octave bassoon | /r/HasAspect | up to nine keys
Facets:
Source sentences:
text: He also offers all three instruments with extra keywork for professional players: the F and G instruments having a full whisper key mechanism and F–F♯ link; and the octave bassoon (called "Fagottino" by Wolf) can have up to nine keys, adding a wing speaker key, and C♯, B♭, F♯, and low E♭ keys to the basic children's model.