English: The Telefunken Rollkugel was announced on October 2, 1968 – more than two months before Douglas Engelbart’s notorius demo of his mouse; it was routineley used by 1972, more than 9 years before the first mouse marketed in USA (with the Xerox Star)
Deutsch: Die Rollkugel der Firma AEG-Telefunken wurde am 2. Oktober 1968 angekündigt – über zwei Monate vor Douglas Engelbarts legendärer Demonstration seiner Maus; die Rollkugel war spätestens seit 1972 im Routinebetrieb, mehr als 9 Jahre vor der ersten in den USA (mit dem Xerox Star) vertriebenen Maus.
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Captions
Telefunken ''Rollkugel'' – the 1st computer mouse world-wide – view from below
''Rollkugel'' von AEG Telefunken – die erste Computermaus weltweit – von unten gesehen
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