[Phil]

Good question! I would think this probably dates from the late 1970's. In my senior year of high school (1981) we got a computer in the library, and no one had a clue what to do with it. I can't imagine an elementary school having a computer prior to the mid-late 80's at the earliest, so what this actually is who knows? The teletypes would have been used to interface with a mainframe, so again, super expensive and hard to imagine in an elementary school. Such setups were still in use in colleges in the early 80's here. Perhaps the kids were visiting a college computer lab?