Assertion: spring tooth harrow | /r/HasProperty | developed in the 1860s
Facets:
Source sentences:
text: Spring-tooth harrows (developed in the 1860s) have curved, springy teeth designed for use in rough, stony ground and around roots.
text: Spring-tooth harrows (developed in the 1860s) have curved, springy teeth designed for use in rough, stony ground and around roots.