Assertion: tuba's valve | /r/HasProperty | invented
Facets:
Source sentences:
text: When valves were invented, generally, the French made narrower-bored horns with piston valves and the Germans made larger-bored horns with rotary valves.
text: When valves were invented, generally, the French made smaller horns with piston valves and the Germans made larger horns with rotary valves.[clarification needed]