Build your own working hydraulic machine.· This mini excavator is a great tool to teach the principles of levers & hydraulic power
Made from renewable resources (natural wood and plywood). All parts are included, are machined, and ready for assembly. 
Teaches principles of levers & hydraulic power.
Mechanism includes 2 hydraulic cylinders & can be adjusted to provide either digging or scooping action.
Includes instruction manual.
Model size (approx.): 9 x 32 x 40cm (extended).

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