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Is the paper index number an article number or a circle number?
Yes, the index number, circle number (or letter) consists of two parts. The molecular number (or letter) is the number of the detailed drawing, and the denominator represents the page number of the drawing where the detailed drawing is located. When the details are on this page, the denominator is a short horizontal line. The symbol of the callout consists of double circles and numbers (or letters). The number of numbers (letters) is consistent with the index number.