Well done! I figured someone would recognize it.
I recently brought my kids to OMSI on a trip to Portland and we did the tour of the Sub. Very cool. I had no idea that these subs were basically EV's! - serial hybrids (like my Volt) -they ran electric when deep and surfaced to run generators to charge the enormous battery banks. Some serious DC amps coming out of those diesel generators.
A lot of instrumentation. I have no idea what that Tektronix DSO was doing there - obviously not original equipment on these vintage subs. It had a sine wave displayed. Maybe just to look cool for the visitors?