Julie Porter wrote in 150608 MMDigest:

> Patent diagrams showing this are posted here in the MMD
> technical section.

I couldn't locate the diagrams so Julie kindly sent me the link and
I found it was right under my nose!  The technical article is titled
"Wurlitzer Long Roll Tracker Frame", in the MMD Technical Library at

  http://www.mmdigest.com/Gallery/Tech/WurLongFrame/index.html 

Robbie Rhodes, MMD