I have received prints from a customer that had equipment designed in Europe. There is a dimension scheme on the page that I have not seen before and can not find a ISO standard that discusses it. It is a linear dimension between to cylindrical features (hole or boss) and on either side of the dimension it has two parallel lines going horizontally. See attached image. My assumption is that it is some kind of parallelism instruction. Could someone please help me understand the meaning.
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