machinist vs stagehand

machinist

noun
  • A person employed to shift scenery in a theater. 

  • A constructor of machines and engines; one versed in the principles of machines. 

  • One skilled in the use of machine tools for fashioning metal parts or tools out of metal. 

  • A person who operates machinery. 

stagehand

noun
  • A person who works behind the scenes at a theatre or in other theatrical media. 

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