Assertion: balsa | /r/HasProperty | standard material
Facets:
value: for model airplane construction
type: PURPOSE
Source sentences:
text: With that in mind, it is easy to understand why balsa wood has been the standard material for model airplane construction since it first became readily available in the U.S. in the late 1920's.
text: With that in mind, it is easy to understand why balsa wood has been the standard material for model airplane construction since it first became readily available in the U.S, in the late 1920s.
text: With that in mind, it is easy to understand why balsa wood has been the standard material for model airplane construction since it first became readily available in the U.S. in the late 1920's.