Assertion: keyboard instrument's string | /r/HasProperty | struck by hammer
Facets:
Source sentences:
text: Its strings are struck by hammers which are connected to the keys.
text: definitely percussion as said before can't remember who by but the strings are hit with hammers so its percussion and technically there is no such thing as a keyboard family
text: The dulcimer is a psaltery having strings that are struck with hammers rather than plucked.
text: Its strings are struck by hammers which are connected to the keys.