pair of scissors vs throatless shear

pair of scissors

noun
  • A tool used for cutting thin material, consisting of two crossing blades attached at a pivot point in such a way that the blades slide across each other when the handles are closed 

throatless shear

noun
  • A cutting tool used to make complex straight and curved cuts in sheet metal. 

How often have the words pair of scissors and throatless shear occurred in a corpus of books? (source: Google Ngram Viewer )