Theory of Machine
Oldham's coupling is the

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

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Theory of Machine
Lower pairs are those which have

Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion
Two elements that permit relative motion

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