I am in the preliminary stages of designing a roll scanning and
punching system and am hoping to anticipate and avoid format
compatibility problems.  I would appreciate any information on punch
step increments used to produce the old rolls. I plan to start with
Duo-Art rolls duplication, but would like to expand to other formats if
this is successful. I plan to punch the new rolls at the same step size
as the originals to maximize speed and accuracy. The holes in the old
paper are difficult to measure exactly. So far I have found that the
step sizes are close to, but not exactly, fractional inches, 1/32"
being the most common. Actual historical information about what the
machines were made to punch would be the most useful.