Assertion: piston trombone | /r/CapableOf | call perinet valves
Facets:
value: by using valves
type: MANNER
Source sentences:
text: Unlike the slide trombone, the piston trombone changes the size of the tube not by physically extending or contracting it, but by using valves, called Perinet valves, to cut off the flow of air in parts of the trombone.