Assertion: manhole cover | /r/MadeOf | ductile iron
Facets:
value: traditionally
type: OTHER
value: in some cases
type: TEMPORAL
Source sentences:
text: Traditionally most manhole covers were made from ductile iron, but with modern-day advanced technology, the options are unlimited, and offer similar loading performance.
text: Manhole covers are made with different materials such as cast iron, ductile iron, concrete and in some cases, with glass reinforced plastic (GRP).
text: Traditionally most manhole covers were made from ductile iron, but with modern-day advanced technology, the options are unlimited, and offer similar loading performance.