[ Richard Groman wrote in 170511 MMDigest:

> The upright piano is a Paul G. Mehlin & Sons with a Trio-Art
> mechanism installed.

Mehlin were very high quality pianos.  Without some photos of the
player machinery it's hard to say -- likely Welte or Recordo.  If you
can provide photos, it ought to be a shoe-in to decide what it is.

Tom Binnall