Centreless wheels

I couldn't work this out at first. I'm pretty sure all the tyre balancers I've ever come across have mounted the wheel on studs and spun it round, not needing a hole in the middle. When did they change?

They changed the other way, almost all used to be hole in the centre only in the past decade have 4 stud mounts started to circulate, as usual its french stuff making garages lives just that tiny bit harder.
 
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