Assertion: chlorine dioxide's chlorine | /r/AtLocation | use
Facets:
value: for many thousands of years
type: TEMPORAL
Source sentences:
text: Did you know that Chlorine has been in use for many thousands of years, but pure Chlorine was produced/discovered by humankind only in the 18th century?
text: Chlorine has been in use for thousands of years in other forms, but it wasn't named until 1810 by Sir Humphry Davy.