Assertion: walrus's bone | /r/ObjectUse | used for tool
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: The meat, often preserved, is an important winter nutrition source; the flippers are fermented and stored as a delicacy until spring; tusks and bone were historically used for tools, as well as material for handicrafts; the oil was rendered for warmth and light; the tough hide made rope and house and boat coverings; and the intestines and gut linings made waterproof parkas.
text: Tusks and bones were used for tools, art, and fashion.
text: The bones and tusks are used for weapons, tools and carvings.