Assertion: contact transistor | /r/HasProperty | invented by heinrich welker
Facets:
value: independently
type: MANNER
value: in 1948
type: TEMPORAL
Source sentences:
text: In 1948, the point-contact transistor was independently invented by German physicists Herbert Mataré and Heinrich Welker while working at the Compagnie des Freins et Signaux, a Westinghouse subsidiary located in Paris.