Theory of Machine
Oldham's coupling is the

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

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Theory of Machine
The inversion of a mechanism is

Obtained by reversing the input and output motion
Turning its upside down
Changing of a higher pair to a lower pair
Obtained by fixing different links in a kinematic chain

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