> A good source is the Ken+Dennis picture:
>
> https://www.bell-labs.com/usr/dmr/www/picture.html
>
> Noel

There is actually another photo from the same session:

https://computerhistory.org/wp-content/uploads/2019/10/102685442.03.01.jpg

From a higher angle too so you can see both the 20 and the 45 to its left there.  Not very much more to be gleaned from it but it does feature the bezels of both PDP-11s.

- Matt G.