A display similar to the Type 30 CRT can be seen in action in this video of a Bell-Labs educational film: http://www.youtube.com/watch?v=iwVu2BWLZqA ("The Incredible Machine", 1968).

The video shows later equipment, a PDP-5 and a display that looks like a member of the 330/340-family, but the technology is the same. (Interactive graphics technology like in TX-2 and the PDPs was actually amazing, but apparently got lost over time-sharing ...)