Assertion: working transistor | /r/HasProperty | invented by walter brattain
Facets:
value: at bell labs
type: LOCATION
value: in 1947
type: TEMPORAL
Source sentences:
text: The first working transistor was a point-contact transistor invented by John Bardeen and Walter Brattain in 1947 at Bell Labs, where William Shockley later invented the bipolar junction transistor (BJT) in 1948.