Assertion: thermionic diode | /r/HasProperty | primary device
Facets:
value: for radio communications
type: PURPOSE
value: for other electrical devices
type: TRANSITIVE-OBJECT
value: until the invention of the transistor
type: TEMPORAL
Source sentences:
text: In fact, the thermionic diode, patented by John Ambrose Fleming in 1904, was the first vacuum tube, which was the primary device for radio communications and other electrical devices until the invention of the transistor.