Contraction Rules

Can anyone suggest where I might get a 3 ft contraction rule with
imperial measurements? Everywhere seems metric nowadays.
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Further, I think most casting designs are spit out by CAD with the shrinkage already done, so the (modern) patternmaker doesn't need a contraction rule at all.
A contraction rule allows a pattern to be made when working off the drawings for the finished casting, back in the days when making a second set of drawings for the patternmaker would have been... laborious.
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