Assertion: hafnium | /r/ObjectUse | used in vacuum tubes
Facets:
value: as a getter
type: PURPOSE
value: according to jefferson lab
type: OTHER
Source sentences:
text: It is used in vacuum tubes as a getter, a substance that combines with and removes trace gases from the tubes, according to Jefferson Lab.
text: Hafnium is also used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes.
text: Hafnium is also used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes.