An item on eBay is titled ANTIQUE GERMAN AMERICAN PIANO PLAYER ROLL.
The only use I can think of for what I see is as some kind of aid to
playing the piano.

If someone knows what it's for or has another idea I'd love to hear
about it !

https://www.ebay.com/itm/267284832588 
ANTIQUE GERMAN AMERICAN PIANO PLAYER ROLL 4FT (49.25")
UNKNOWN SONG

Lee Rothrock
Springfield, Oregon
crooner.at.large@gmail.com.geentroep [delete ".geentroep" to reply]

[ My guess is it's an Accordion Player Roll. -- Robbie :)