The slide rule shown intrigued me as well. I've added two stills to my pennine56 folder in case of use to folk without access to the programme.

The reverse seems to be shown, possibly duplex slider but not stock. It has what looks like metal straps across the stocks either end to presumably strengthen. Cursor not obvious

It doesn't seem to be the Nestler 23 associated with Einstein.The setting seems to be the Bern Patent Office.

David