Wiktionary
secondary industry
n. (context economics English) An industry that processes raw materials produced by primary industry into goods suitable for tertiary industry to provide goods or services to consumers.
Usage examples of "secondary industry".
But the weapons were mostly used for harvesting, rather than destruction, for over the centuries a secondary industry for Gutien and Nan had been built on the collection of debris between the rings and the refinement of metals, mostly iron, aluminum, and indium.