Theory of Machine
In a simple harmonic motion, the velocity vector with respect to displacement vector

Lags by 90°
Leads by 90°
Is in phase
Leads by 180°

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Theory of Machine
Oldham's coupling is the

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

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