Assertion: bar linkage | /r/HasAspect | a point of rotation
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Source sentences:
text: Non-Grashof linkages are also possible when the sum of the lengths of the shortest and longest links is equal to the sum of the other two links, p and q. When this is true, the four-bar linkage can be found in any of the four Grashof states but will have a point of rotation in which all pivots will be collinear, which is referred to as the change point.