cast iron vs industry

cast iron

noun
  • A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould. 

adj
  • Inflexible or without exception. 

  • Made of cast iron. 

  • Durable; tough; resilient. 

industry

noun
  • A typological classification of stone tools, associated with a technocomplex. 

  • The sector of the economy consisting of large-scale enterprises. 

  • The tendency to work persistently. Diligence. 

  • Businesses that produce goods as opposed to services. 

  • Businesses of the same type, considered as a whole. Trade. 

  • Automated production of material goods. 

How often have the words cast iron and industry occurred in a corpus of books? (source: Google Ngram Viewer )