Assertion: led's use | /r/MadeOf | the discovery
Facets:
value: for several decades
type: TEMPORAL
Source sentences:
text: His research was distributed in Soviet, German and British scientific journals, but no practical use was made of the discovery for several decades.
text: Vladimirovich Losevreported on the creation of a first LED in 1927.His research was distributed in Russian, German and British scientific journals, but no practical use was made of the discovery for several decades.
text: His research was distributed in Soviet, German and British scientific journals, but no practical use was made of the discovery for several decades.