microfiche vs mimeograph

microfiche

noun
  • A device used to magnify and read these sheets. 

  • A sheet of microfilm, six by four inches, holding several hundred reduced images of document pages, read using a microfiche reader or microfilm reader. 

verb
  • To convert (documents) to microfiche format. 

mimeograph

noun
  • A machine for making printed copies using typed stencil, eventually superseded by photocopying. 

verb
  • To make mimeograph copies. 

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