The ordinary "Green" Welte instruments play 88 notes, not 86.  The
T-98 system was sold to restaurants, cafés and saloons under the name
"Welte-Pianon", normally but not always with a cheap "Tormin" piano.

The rolls for a Welte-Pianon are identical to Welte-green rolls, but
have other spools.  Special Pianon rolls in the 9000- and 9500-series
combined two to four titles per roll from the ordinary Welte-Mignon
catalogue.

Sometimes one can find labels with a small sticker "Pianon" glued onto
the word "Welte-Mignon".  All Welte-Pianon pianos play 80 notes only.
They have the ordinary Mignon stacks with 88 valves, but are equipped
with only 80 pneumatics.

Apart from the Pianon T-98 instruments, I have seen some Steinway
Welte-Mignon "Green" uprights and grands also playing only 80 notes.

Kind regards from Germany,

Hans-W. Schmitz
Stuttgart

 [ Hans-W. Schmitz is co-author, with Gerhard Dangel, of the book,
 [   Welte-Mignon piano rolls: complete library of the European
 [     recordings 1904 - 1932 for the Welte-Mignon reproducing piano.
 [   Welte-Mignon Klavierrollen: Gesamtkatalog der europäischen
 [     Aufnahmen 1904 - 1932 für das Welte-Mignon Reproduktionspiano.
 [   Stuttgart 2006.  ISBN 3-00-017110-X
 [ Available from Musikwerkstatt Monschau, Thomas Jansen, see
 [   http://www.maesto.com/US/newbookaboutwelt.html 
 [ -- Robbie