Theory of Machine
Two systems shall be dynamically equivalent when

The mass of two are same
All of these
G. of two coincides
M.I. of two about an axis through e.g. is equal

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Theory of Machine
Oldham's coupling is the

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

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