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The lengths of the links of four-bar linkage ACBE comply with the conditions: C͞B=0.27A͞C, B͞D=0.83A͞C, E͞B=1.18A͞C and A͞E=0.64A͞C. When link 1 is turned about fixed axis A, point D describes path q-q of which portion a-a approximates a straight line. The approximately rectilinear horizontal portion a-a of connecting-rod curve q-q is used to carry loads horizontally.