Considering the relatively primitive state of technology in 1968 compared to what's available today this is a fairly impressive attempt at building an articulated robot appendage. This would have been at a time when there was still a great deal of optimism about AI and its rate of progress, where nothing like this had been done previously, and prior to the production of the Lighthill report and Perceptrons.
It looks like the arm is hydraulically actuated, since pneumatics probably wouldn't be strong enough to hold the weight of a child. The complicated kinematics, which would normally require quite a bit of processing power, are bypassed by having a small model which contains a few potentiometers, with Minsky manually solving the inverse problem.
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