Assertion: transistor | /r/MadeOf | germanium
Facets:
value: of semiconductor material
type: OTHER
value: in 1950s
type: TEMPORAL
Source sentences:
text: The first transistor is made of semiconductor material, germanium in 1950s.
text: The 2N2222 transistor is made of either germanium or silicon that has been saturated with either a positively or negatively changed material in a process called “doping.