brow vs read/write head

brow

noun
  • The forehead. 

  • The ridge over the eyes; the eyebrow. 

  • A gallery in a coal mine running across the face of the coal. 

  • The first tine of an antler's beam. 

  • The hinged part of a landing craft or ferry which is lowered to form a landing platform; a ramp. 

  • The gangway from ship to shore when a ship is lying alongside a quay. 

  • Aspect; appearance. 

  • The projecting upper edge of a steep place such as a hill. 

verb
  • To bound or limit; to be at, or form, the edge of. 

read/write head

noun
  • A combination read head and write head 

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