Mister Rogers is shown a player piano and he plays a roll.  They
look inside an Aeolian player.  Then they watch a movie on making
rolls at the QRS factory with the old three-to-one masters.  They
make the rolls, the tabs, spool them and box them up.

  http://www.youtube.com/watch?v=L3JYwY6V0M8

D.L. Bullock
www.pianoworld.us