Roll Changer in the
Wurlitzer Style 29C Mandolin PianOrchestra.
Philipps Pianella Model 29 (Mandolino)
(Knott's Berry Farm, 1989)

Located behind the roll changer is the piano, with its mandolin attachment. Directly below the roll changer and its supporting shelf is the main valve chest or stack. The original Philipps stack was thrown out a long time ago, and in its place sits a makeshift replacement, which is partially visible.