The DeBence Museum has a Maestro 50-note push-up piano or organ player
built in Elbridge, New York.  I posted about this about two years ago,
as we are missing a lot of parts, and are not even sure what is missing.
See https://www.mmdigest.com/Archives/Digests/201709/2017.09.27.05.html 

I got a reply some time back from someone with a lot of info, but I lost
his address in a computer crash.  He thought he had what we needed, but
was waiting for spring to get at the parts.  Well, spring has come and
gone.  This is an historically important piece, but it is useless unless
we can complete the restoration.  Does anyone have any information about
this unit?

Scotty Greene - DeBence Museum
Franklin, Pennsylvania

 [   operators side
 [ http://www.mmdigest.com/Attachments/19/11/27/191127_145819_Maestro%20operator%20side.JPG
 
 [   keyboard side
 [ http://www.mmdigest.com/Attachments/19/11/27/191127_145819_Maestro%20piano%20side.JPG