Assertion: windmill | /r/HasProperty | developed
Facets:
value: from the 12th century
type: TEMPORAL
value: from technology
type: OTHER
Source sentences:
text: Windmills are not a new source of energy : they have been used to produce mechanical power or to pump water since several centuries ago, and they are now being developed to generate electricity, but not in very significant amounts, as can be seen below.
text: Windmills were developed from the 12th century, apparently from technology gained by crusaders who came into contact with windmills in the Middle East.