Theory of Machine
The Klein's diagram is used when

Crank has uniform angular acceleration
Crank has uniform angular velocity
Crank has nonuniform angular velocity
Crank has nonuniform angular acceleration

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Theory of Machine
Open pairs are those which have

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

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