Since 2 October 1968, more than two months before Engelbart&39;s demo, a mouse device named Rollkugelsteuerung (German for "rolling ball control") was shown in a sales brochure by the German company AEG-Telefunken as an optional input device for the SIG 100 vector graphics terminal, part of the system around their process computer TR 86 and the TR 440 main frame. .