Assertion: electric organ's keyboard | /r/HasAspect | 49 keys
Facets:
Source sentences:
text: The upper keyboard has 49 keys, and the lower manual has 30 Treble keys and 19( Bass keys which can be switched to extend the Treble section.
text: The upper keyboard has 49 keys, and the lower manual has 30 Treble keys and 19( Bass keys which can be switched to extend the Treble section.