Thought of your camera the other day.
I was in the Rutherford B. Hayes Presidential Library, looking through photo archives for swing-lens panos of local towns from 100 years ago, that I could re-photograph with modern gear.
The archivist brought me a tray of stuff, from two local photogs. from 100 years ago: Langlois and Niebergall.
Niebergall shot a lot of panos, and was very good. But not swing-lens.... the straight lines were straight, and the negatives were about 5x11, and bore witness marks of being in a LF filmholder! They actually looked very much like I imagine your negatives look.
I wrote up a little article about the experience, and may post it in this forum under another thread. It made for an interesting morning....