Were there ever any MF Slide duplicators/slide copiers available? 35mm seems to have been very commonplace but for MF I haven't found anything that isn't the newly made one by Pentax.
Someone must of had one, most likely Rollei or Hasselblad. Using a good film scanner with scanning software will yield better results than a slide copier. There might be one or two professional labs that will make a dupe if you look hard enough.
Yes indeed, Hasselblad had one. It mounts on the 135mm lens.
If you want to know how it looks like, let me know and I will post some pictures when I am back home in a few days.