binder clip vs paperweight

binder clip

noun
  • A simple device for binding a few to many sheets of paper, leaving the sheets intact; a strip of spring steel bent into the shape of an isosceles triangle with loops at the apex. 

paperweight

noun
  • A small, decorative, somewhat weighty object placed on one or more pieces of paper to keep them from fluttering away. 

  • Any object used for this purpose. 

  • A useless piece of equipment. 

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