John Lawson wrote:
   Taking our cue from a recent long and nearly-immortal thread on
 Oscilloscopes; sub-Tektronix scopes; sub-sub rack-mount Tek scopes -
 Marvin and I concocted a nice visual in-joke.  I mounted a working RM503
 in the rack with my PDP 11/44 and waited for one of the Listmembers to
 notice it and laugh.  And I waited....  and waited....
   Nobody got it!   O well.... 
I noticed it only on the pictures Erik posted.
http://www.vintage-computer.com/images/VCF5/John%20Lawson.jpg
But I just thought, it was easier to transport this way.
Was looking more on the pdp11 stuff anyway ;-)
cheers