The hartung gamemaster is not the same as the supervision. The games look the same, but does not work in a supervision. However Hartung did make a supervision. The supervision was sold in 1992 by different companies all over the world.
Watara Supervison in USA, Canada, spain and Italy
Quickshot supervision in the UK
Hartung Supervision In the Netherlands (Were I live )and germany
Audio Sonic Supervision All over Europe
Vini Supervision in Denmark
Videojet supervision in France
Maganum Supervision in the USA and in Europe
One with a unknown name in Hong Kong and China
The Electrolab Supervision mentioned is new for me.
Hopes this will help