The object is the plasma display portion of a Plato student terminal (with touch screen capability) deployed at the University of Illinois. It is a metal box with plywood sides. There is a DB-25 connector on the front and two DB-25 connectors on the back. There are three rocker witches also on the front panel below the display.
Manufacturer
Carroll Manufacturing
Identifying Numbers
Other number
5021
Printed on a sticker above a DB-25 connector on the front
Other number
PL-769818
Handwritten on a yellow sticker on the left side and denoted "Department of Physics University of Illinois"