The IBM Industrial Keyboard with TrackPoint II or Pointing Stick were variants of the Model M13 designed for blending in with industrial environments. Like other industrial IBM keyboards, the grey casing is for hiding dirt and discolouration expected to be inflicted upon the keyboard within an industrial environment. The first industrial M13s were built by Maxi Switch for IBM and were fitted with TrackPoint II pointing sticks, however, Unicomp later produced a visually indistinguishable version that used Unicomp's FSR pointing stick instead.
