List of QRS Apollo 15.25" Rolls, compiled by Troy Taylor

Apollo Player Pianos, manufactured by Melville Clark Piano Co.

The "Solo Apollo" expression mechanism features two separate pneumatic actions, one to play the Accompaniment
and the other to play the melody or Solo part of the song.  The music roll is 15.25 inches wide,
punched at 9 holes per inch, for 134 channels total to control the notes and expression.
 
 

Magazine advert circa 1912
 

"Melville Clark - Chicago, New York, London - Apollo Concert Grand"
This very early 88-note push-up player, discovered by Alan Turner of Winnipeg,
Manitoba, Canada, plays music rolls 15.25 inches wide, punched 6 holes per inch.
It also could play 65-note rolls of 11.25 inches wide, punched 6 holes per inch.

template image, 200 dpi

(displayed at about half size)