Link 1, rotating about fixed axis A, is connected by turning pair D to link 2. Link 2 is connected by a four-motion kinematic pair to link 3. This pair consists of flat surface b of link 2 and cylindrical pin a of link 3. Link 3 rotates about fixed axis B. The mechanism transmits rotation between any two arbitrarily located axes A and B.
$577$LW,4L$