Danny, Google Maps offers Akerstraat, Heerlen, the Netherlands, could be that the one? You can find it at:-
https://maps.google.co.uk/maps?f=q&s...k&cd=1&spell=1
If it is, the little yellow man can be dropped into it to view and wander as you please.
As to the Volkspark, sorry to yet again shoot your fox (must learn to be patient!). It is somewhat unsettling if a former home no longer exists, as though one's own life is being airbrushed from history.
From what you say, the Smith-Jaeger system deserved better than its brief spell in the limelight. It certainly deserves a better epitaph than the web affords it. Little or nothing there, and what is mainly in French. It would appear that Smiths saw it as just another product. Make the money, move on. A shame!