Steinway double keyboard piano

[David Boyce]

Steinway seemingly only ever made the one example of the Emanual Moor Double 
Keyboard Piano, but a handful of other makers produced a few each, and 
Bosendorfer seem to have made more than anyone else.  Here's some 
information on the Bosendorfer examples: 
http://www.hurstwoodfarmpianos.co.uk/news.php?news_id=14