Theory of Machine
The example of completely constrained motion is a

Motion of a shaft with collars at each end in a circular hole
All of these
Motion of a square bar in a square hole
Motion of a piston in the cylinder of a steam engine

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Theory of Machine
Oldham's coupling is the

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

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