Assertion: tank's use | /r/PartOf | 20th century
Facets:
value: in the united states
type: LOCATION
value: in england
type: LOCATION
Source sentences:
text: In short, whilst the development of the continuous track engaged the attention of a number of inventors in the 18th and 19th centuries, the general use and exploitation of the continuous track belonged to the 20th century, mainly in the United States and England.