Assertion: molybdenum | /r/HasAspect | industrial use
Facets:
value: for about a century
type: TEMPORAL
value: due to the immaturity of metallurgical techniques
type: CAUSE
Source sentences:
text: For the next century, molybdenum had no industrial use.
text: Molybdenum had no industrial application for about a century due to the immaturity of metallurgical techniques, difficulty extracting the metal in pure form, and its relative scarcity.