> .109 by .112 is pretty weird

Row spacing is .106 +/- 0.006" , pin spacing is either 0.108"
(2.74mm, 9 pin) or 0.109" (2.77mm, others)

Presumably the 0.100" is the minimum imperial measurement
thought to be required at the time and 0.006" is a manufacturing
tolerance

http://www.fct-electronic.de/Englisch/prod/mini/Lochbi.asp

Conform to IEC 207-3 and DIN 41652

DIN = Deutsches Institut fur Normung

http://www2.din.de/index.php?lang=en

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