Operators Piano Company
Mid-Era Style A Roll Mechanisms

Coinola mid-era style A roll spoolbox.
Operaotrs early style A roll spoolbox.

(Photographs courtesy of Art Reblitz)

The middle-era A roll spoolbox (top and bottom photographs) has steel side plates instead of the earlier cast iron frames. The tracker bar is mounted forward of the roll spools, and the roll winds from the front of the supply spool to the front of the takeup spool. These pictures show this style spoolbox in two different pianos, one with a roll in place and one without.