Theory of Machine
A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

Hyperbolic path
Elliptical path
Straight line path
Parabolic path

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Theory of Machine
Open pairs are those which have

Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Two elements that permit relative motion

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