Dale, thank you for the lifespan info for LeRoy Duning. This was the first response I received! I've obtained a rather poor-quality photo of the Duning brothers working at a drafting table—I say "poor-quality" because it was taken from a printed photo, with coarse dots. Still, sometimes you gotta grab what you can get. Do you by any chance have a photo of LeRoy Duning, or know anything about his family? Surviving relatives, for example? Did he live in Ohio?