throatless shear vs tin snips

throatless shear

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

tin snips

noun
  • Large, heavily-constructed scissors or shears, operated by hand and used for cutting sheets of metal. 

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