Theory of Machine
Oldham's coupling is the

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

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Theory of Machine
In a four bar chain or quadric cycle chain

Two are turning pairs and two are sliding pairs
Three are turning pairs and one is a sliding pair
Each of the four pairs is a turning pair
One is a turning pair and three are sliding pairs

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