Assertion: marimba's key | /r/HasProperty | connected to the pipe valves
Facets:
value: via wooden trackers
type: MANNER
value: physically
type: MANNER
Source sentences:
text: Up to the turn of the 20th century, all pipe organs were operated by a tracker, tubular pneumatic, or pneumatic Barker-lever action, where the keys and pedals were physically connected to the pipe valves via wooden trackers, except in the case of tubular pneumatic, where all actions were operated by air pressure.