primal vs pulley block

primal

noun
  • A primal cut (of meat). 

adj
  • Being the first in time or in history. 

  • Of greatest importance; primary. 

  • Being one of the pieces of meat initially separated from the carcass during butchering, prior to division into smaller cuts. 

verb
  • To take part in primal therapy. 

pulley block

noun
  • A shell containing one or more sheaves, the whole forming a pulley. 

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