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PCInteresting. If you are hypothesizing that an ACT print sheet was 27.625 inches wide, that would accout for 19 full size T206s across, with a little extra room for the outside borders of the sheet.
According the Standard Catalogue, T206s are 1-7/16 inches wide (that's 1.4375 inches wide). And 27.625 divided by 1.4375 is 19.217.
I suspect the actual ATC print sheet was a little wider than 27.625 inches, to provide a little more room for the sheet border. Anyone know the width of the Obak partial sheet above?