Assertion: french horn's valve | /r/HasProperty | introduced by heinrich stölzel
Facets:
Source sentences:
text: In 1818 rotary valves were introduced by Heinrich Stölzel and Friedrich Blümel (later, in 1839, piston valves were applied to the horn by François Périnet), initially to overcome problems associated with changing crooks during a performance.
text: In 1818 rotary valves were introduced by Heinrich Stölzel and Friedrich Blümel (later, in 1839, piston valves were applied to the horn by François Périnet), initially to overcome problems associated with changing crooks during a performance.