Assertion: contact transistor | /r/HasProperty | developed by walter brattain of bell labs
Facets:
value: in 1947
type: TEMPORAL
value: in 1948
type: TEMPORAL
Source sentences:
text: A functional point-contact transistor was developed by John Bardeen and Walter Brattain of Bell Labs in 1947 and by Herbert Mataré and Heinrich Welker of Compagnie des Freins et Signaux in 1948.