Can anyone tell me about this 1970s or '80s O-Roll frame?  It has
gold anodized aluminium sides, two pneumatics and two 110 VAC Dayton
(Grainger) gearmotors.  The 20 RPM lower gearmotor drives the lower
spool via 3-sheave aluminium pulleys and triple belts (made of rubber
tubing).

Who made it?  I know the belts were prone to breaking.  I'd also
appreciate opinions of the design.

Ed Gloeggler

 [ I'll place Ed's photos and description at the MMD Tech site
 [ under the heading "Music Roll Spool Frames & Readers", at
 [ http://mmd.foxtail.com/Tech/  -- Robbie