I did some new research about the perforators at Keystone, and
learned that, contrary to my previous statement (digest.95.07.01), 
for current production of Ampico rolls Keystone is using original
sprocketed masters "wherever possible".

My original information was from a conversation several years ago
with Keystone partner (at that time) Bob Taylor, of Philadelphia, who
told me that the Ampico masters were far too fragile to use for
production and therefore would be stored away until the day came that
they could be copied.  He explained that in addition to the sprocket
holes, the master rolls have several additional control channels, and
thus a special extra-wide perforator was needed to make a copy.

But obviously this plan of preserving the masters fell through.  The
thin and brittle Ampico masters, many which were already torn and
crumbling when Harold Powell owned them, are still in use in use at
Keystone, and I presume they have not yet been copied or preserved.
I wring my hands at this discouraging thought.

-- Robbie Rhodes <rhodes@foxtail.com>  5 July 1995