Assertion: centrifuge | /r/AtLocation | use
Facets:
value: since the end of the 1700s
type: TEMPORAL
Source sentences:
text: Other centrifuges, the first being the Zippe-type centrifuge, separate isotopes, and these kinds of centrifuges are in use in nuclear power and nuclear weapon programs.
text: I don't know how reliable that source is, but I do believe that centrifuges had been in use since the end of the 1700s.