Assertion: clarinet | /r/HasAspect | two keys
Facets:
value: for nineteen notes
type: OTHER
value: in its lowest register
type: LOCATION
Source sentences:
text: Up until the first half of the eighteenth century, the clarinet only had two keys.
text: A clarinet must have holes and keys for nineteen notes, a chromatic octave and a half from bottom E to B♭, in its lowest register to play the chromatic scale.
text: These clarinets only had two keys that were mostly made from brass along with the springs.
text: They had two keys, later three (our description depicted here shows two: left thumb and left forefinger).