Ah. Okay. I think this might be a problem: The teeth on the end of each hub suggest that these are used with a Shimano Nexave rollerbrake. The hubs in that wheelset are (unless I am totally mistaken) rear: 3-speed Nexus IGH, front: Power Modulator (which I think is a way to make the front rollerbrake more user-friendly when sudden force applied).
So to get these working, you’re looking at getting two rollerbrakes and a frameset with fork/rear stay loops to attach the rollerbrake arm to. And non-turn washers for the dropouts too. Oh, and a bell crank and shifter to control the rear 3-speed!
Of course, you could use these with rim brakes, but that defeats the point.
That said, looks like it’s in really good shape - the Nexus 3 on the back is definitely worth having a play with.