french curves

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French Curves

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Anton ullrich invented the folding ruler in 1851. French chassepot bayonet & scabbard m1866 1872 st.

Anton ullrich invented the folding ruler in 1851. Frank hunt later made the flexible ruler in 1902. The equivalent of a ruler for drawing or reproducing a smooth curve, where it takes the form of a rigid template, is known as a french curve.