What are you actually in need of, Angus ... how deep
do you need to go?
By the way, you do know that GMDN and UMDNS are different, I hope?
When it comes to allocating UMDNS codes, I believe that the equipment manufacturer is supposed to do that; but don't quote me.
As I have made clear in various threads on this and similar topics over the years - I am not a great fan of any
of the so-called "global" codes. Yes; you're right - ECRI used to be "not for profit".