The brakes I've worked on had a light compression spring that held the shoe against the backing plate, so there was never a problem holding the shoe in place while stretching the springs into place. I never needed extra hands, and I don't see how these tools would have helped?
Could be they are for larger (truck) drums. Or very old drum brakes, say 30's-40's.
He wasn't that old, probably in his late 70s to early 80s...Larry
Hmm, Well, we're probably all wrong and they have nothing to do with brakes!
btw, I did a google image search for any matching images and came up with zip.