In response to John Kelsey's request, here are some images of a Duo-Art
steamboat pump with a 1924 Steinway in which the pump is contained in
the piano stool. This instrument is located in Aix-en-Provence, France.

Brian Chesters

 [   Duo-Art steamboat pump 1
 [ https://www.mmdigest.com/Attachments/21/01/23/210123_150827_C5D74691-4AAF-4CE4-8154-738E09C4BDB6.jpeg 
 [   Duo-Art steamboat pump 2
 [ https://www.mmdigest.com/Attachments/21/01/23/210123_150827_C9821825-3C8F-4767-B1CA-D08011F39466.jpeg 
 [   Duo-Art steamboat pump 3
 [ https://www.mmdigest.com/Attachments/21/01/23/210123_150827_7FFEAFE7-F267-4E62-B820-332861153482.jpeg