Assertion: keyboard's key | /r/ObjectUse | used on the organistrum
Facets:
value: certainly
type: MANNER
Source sentences:
text: Keys of the last type were certainly used on the organistrum, a large medieval hurdy-gurdy operated by two players: one turned a crank rotating a wheel that rubbed against one or more strings to make them sound, while the other produced different notes by turning the key-shaped levers that stopped the strings at various points (much as guitar strings are stopped against the fingerboard).