Steffen Just was asking about locations of piano roll making equipment
[230322 MMD]. Yes, I believe MIM has the QRS recording piano though
I don't know if it is actually on display.

I heard the J. Lawrence Cook arranging machine was perhaps in a museum
in New York State; perhaps Bob Berkman knows, or others on some of the
Facebook groups may know. It seems I heard mention of it in the last six
months.

Finally, this great article by Art Reblitz features some photos of roll
making equipment:

https://mechanicalmusicpress.com/history/articles/cgo_rolls.htm#Clark_steps 

Julian Dyer has also featured some of the arrangers at their arranging
tables in presentations he's done. Some or all of those images may be
found on the Pianola.org website: http://pianola.org/ 

Finding old arranging tables may be tricky. It would be interesting to
know if some of the grid printed paper is around.

Paul Johnson