A design technique which makes use of the unique inflection circles that result when the instant center (pole) falls at a fixed pivot or at a link pivot is developed to synthesize a 4-bar linkage which has a point or points on its coupler plane which trace two straight-line motions of specified angular displacements for two adjustments of a “fixed” pivot. When combined with an adaptation of the Euler-Savary equation, this technique can be used to synthesize a 4-bar linkage having a coupler point which traces three straight-line motions for three specified adjustments of a fixed pivot.

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