Assertion: manhole cover | /r/HasProperty | formed of cast iron
Facets:
value: traditionally
type: OTHER
value: conventionally
type: OTHER
Source sentences:
text: Conventionally, these manhole covers have traditionally been formed of cast iron or steel, and consequently have been difficult to handle because of their bulkiness and great weight.
text: Traditionally, manhole covers have been constructed of either cast iron, concrete, or even some combination of the two.