shears vs throatless shear

shears

noun
  • A tool consisting of two blades with bevel edges, connected by a pivot, used for cutting cloth, or for removing the fleece from sheep etc. 

  • Anything resembling a pair of shears in shape or motion, such as a pair of wings. 

  • The bedpiece of a machine tool, upon which a table or slide rest is secured. 

  • An apparatus for raising heavy weights, and especially for stepping and unstepping the lower masts of ships. It consists of two or more spars or pieces of timber, fastened together near the top, steadied by a guy or guys, and furnished with the necessary tackle. Also sheers. 

throatless shear

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

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