Assertion: harmonica | /r/HasAspect | special features
Facets:
value: not uncommonly
type: DEGREE
value: in early 20th centuries
type: TEMPORAL
value: in the late 19th
type: TEMPORAL
Source sentences:
text: In the late 19th and early 20th centuries, harmonicas not uncommonly had special features on the covers, such as bells, which could be rung by pushing a button.