Here is a mechanical marble machine with a handle that you can crank to get 5 glass balls marching up the stairs. Once there, they roll down to queue at the bottom for the process to start all over again. This machine measures 51cm long, 34cm tall and 13cm deep.
More gadgets like this: here
Hand-crank marble climber machine - Gadgetify
This stairs marble machine is made of beech wood. It ships with 5 glass marbles.
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