Assertion: tuba's valve | /r/CapableOf | switch to the other
Facets:
value: from one bore
type: OTHER
Source sentences:
text: Years later, another German, Fritz Schüller of Markneukirchen, built a quarter tone clarinet, with two parallel bores of slightly different lengths whose tone holes are operated using the same keywork and a valve to switch from one bore to the other.