Theory of Machine
Oldham’s coupling is an inversion of the kinematic chain used in

Elliptical trammels
Whitworth quick return mechanism
Rotary engine
Universal joint

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

The Ackerman steering gear consists of turning pairs
The Ackerman steering gear is most economical
Both (A) and (B)
Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels

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