Oh yes and available for use under license and the license covered only one serial numbered assembly. I held 2 for a while for stage lighting use.WAS there a 13 amp unfused plug?
I imagine a different version covered medical use as they didn't have an identical assembly on their systems.
My experience of portable Xray machines is very dated but then they simply used the BS546 which was also widely used in theatres and farms. To a lesser extent also for domestic cookers and coppers.
I suspect the label originally had one beside a 15A versionwhich would have been a relatively common situation on each ward.

