Different states and countries are using different machines to perforate the sheets
So a perforation could be named equal but appears in a different way
Following for each type of perforation an example will be shown, which is easily to identify and available only with this certain perforation

Blind Holes

Perf blind holes picture is from Queensland-Group at Facebook
The paper of this issue was too thick, so in the middle and especially on the left side the perforation pins were not enable to make clear holes

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