1952 – Meccano Giant Walking Dragline – (British)
There are various websites that contain the full pdf of Meccano Instruction manuals and Meccano Magazines. You can download them from nzmeccano.com .
An early model from 1975.
See also Wes Dalefield's excellent site on the Meccano Giant Walking Dragline here.
See real Walking Draglines and illustrations on the walking mechanism here.