Theory of Machine
The magnitude of linear velocity of a point B on a link AB relative to point A is, (Where ω = Angular velocity of the link AB)

ω × (AB)²
ω² × AB
(ω × AB)²
ω × AB

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Theory of Machine
Oldham's coupling is the

Second inversion of double slider crank chain
Third inversion of slider crank chain
Third inversion of double slider crank chain
Second inversion of single slider crank chain

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