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As a granite manufacturer, maybe it is
not difficult for them to assure flatness, perpendicularity
or parallelism on a certain set of components. The
question is that how to ensure the position tolerance
of holes, while in most circumstances there are many
on granite components and requiring higher position
tolerances. In long there is no certain rules or
instruments to measure the holes positions. But now we
have got a real solution about this. For a special
instruments have been invented by us after years of bending
on holes position tolerance researching.
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