Assertion: tin | /r/HasProperty | one of the earliest metals
Facets:
Source sentences:
text: Studies of early humans have suggested that tin was one of the earliest metals used by humans.
text: Tin is one of the oldest metals known by man.
text: There is evidence from both archaeology and literature that tin was one of the earliest metals to be known and used.
text: Tin is one of the earliest metals discovered by human being.