contributor vs printing press

contributor

noun
  • A person who produces articles published in a newspaper, magazine, online publication, etc. 

  • A benefactor; someone who donates to charity or some cause. 

  • A person (or thing) instrumental in the creation or growth of something. 

  • A person who backs, supports or champions a cause, activity or institution. 

printing press

noun
  • Synonym of printing house, an institutional or commercial publisher. 

  • A mechanical device used for printing text or images repeatedly. 

How often have the words contributor and printing press occurred in a corpus of books? (source: Google Ngram Viewer )