Theory of Machine
The inversion of a mechanism is

Turning its upside down
Obtained by fixing different links in a kinematic chain
Changing of a higher pair to a lower pair
Obtained by reversing the input and output motion

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

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

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