Assertion: whale's oil | /r/ObjectUse | used as whalebone
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Source sentences:
text: 18th- and 19th-century whalers hunted whales mainly for their oil, which was used as lamp fuel and a lubricant, baleen or whalebone, which was used for items such as corsets and skirt hoops, and ambergris, which was used as a fixative for perfumes.