Assertion: liberty trumpet | /r/HasProperty | introduced with newvalve caps and cap buttons
Facets:
value: around 1931
type: TEMPORAL
value: around 1938
type: TEMPORAL
Source sentences:
text: Around 1938-1940 the "New" Number 2-B Liberty Trumpet was introduced (with the "new" valve caps and cap buttons).
text: Around 1931-1932 the "Number 2 Liberty" trumpet was introduced with new valve caps and cap buttons.