Assertion: soprano clarinet | /r/HasAspect | no more than 10–12 keys
Facets:
value: generally
type: DEGREE
Source sentences:
text: Müller was performing on an alto clarinet in F by 1809, one with sixteen keys at a time when soprano clarinets generally had no more than 10–12 keys; Müller's revolutionary thirteen-key soprano clarinet was developed soon after.