gourd vs read/write head

gourd

noun
  • Head. 

  • Any of the trailing or climbing vines producing fruit with a hard rind or shell, from the genera Lagenaria and Cucurbita (in Cucurbitaceae). 

  • A hard-shelled fruit from a plant in Lagenaria or Cucurbita. 

  • The dried and hardened shell of such fruit, made into a drinking vessel, bowl, spoon, or other objects designed for use or decoration. 

  • loaded dice. 

read/write head

noun
  • A combination read head and write head 

How often have the words gourd and read/write head occurred in a corpus of books? (source: Google Ngram Viewer )