Paul,
That outlet in the lower pic, looks rather familiar.
We've had them here for some years now.
Ours actually have an isolation switch on them that also had a thermal overload in series with the switch.
So that if you overloaded the transformer, you had to switch off the switch to reinstate the supply.
Hutch,
The use of the dual voltage, is to enable non-local shavers to be plugged into them,
even the sockets here give you 230/115VAC, through the Secondary of a Centre-tapped transformer I guess.
And yes, this is why the Isolation Transformer is used in these devices, because of the earth-reference free situation. [Linked Image]