Assertion: windmill's patent sail | /r/HasProperty | invented by william cubitt
Facets:
value: in 1807
type: TEMPORAL
Source sentences:
text: Inventions in Great Britain in the late eighteenth and nineteenth centuries led to sails that automatically adjust to the wind speed without the need for the miller to intervene, culminating in patent sails invented by William Cubitt in 1807.
text: Patent sails were invented by William Cubitt in 1807.