...darn it; I didn't realize the "edit" function had gone away or hidden somewhere...
...but could also be used to make a bend in a piece of sheet metal in the field, when the full-size brake was back in the shop. Not good for long bends, but helpful for, say, architectural flashing.
There were also some joining methods for ductwork, similar to a standing seam, for which these would be the cat's flannel nightwear.
And thanks for reminding me where the "edit" button is; it had been a while since I needed to go back and fix/add to a message.