The lengths of the links of four-bar linkage ABCD comply with the conditions: A͞B=B͞E=B͞C, A͞D=2.2A͞B and D͞C=1.3A͞B. When link 1 turns about fixed axis A, point E of link 2 describes a path of which a certain portion approximates straight line q-q, passing through point A.
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