Theory of Machine
Oldham's coupling is the

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

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Moves as the mechanism moves, but joints are of permanent nature
Remain in the same place for all configurations of the mechanism
Vary with the configuration of the mechanism
None of the listed here

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