my thoughts are the same, a tool to break the tire bead while the wheel is still on the auto.
that is how they did it on trips, with those two long handles, it would work well,
it also looks like the spare breaker on the top would be used for other type rims.
I like the looks of it, any other writing on it ?
as for holding a tire open to patch, is there a way to lock it in position ???