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Ligne

The ligne, or line or Paris line, is a historic unit of length used in France and elsewhere prior to the adoption of the metric system in the late 18th century, and used in various sciences after that time. The loi du 19 frimaire an VIII states that one metre is equal to exactly 443.296 French lines.

Current use
Watchmaking There are 12 lignes to one Paris inch (). The standardized conversion for a ligne is 2.2558291 mm (1 mm = 0.443296 ligne), (The French inch at that time was slightly larger than the English one, but the system of 12 inches to a foot and 12 lines to an inch was the same in both cases.) Hatmaking Ligne is used in measuring the width of ribbons in men's hat bands, at 11.26 per international inch. ==Button making==
Button making
The button trade uses the term ligne (sometimes "line"), but with a substantially different definition: . == See also ==
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