photocopy vs photoengraving

photocopy

noun
  • A copy made using a photocopier. 

verb
  • To make a copy using a photocopier. 

photoengraving

noun
  • A process of transferring a photographic image onto a plate which is then etched and printed. 

  • A plate or reproduction made using this process. 

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