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This photo shows how the power from an electric motor (not in photo) is used to turn gears that rotate the eccentric wheel mounted off center atop the gear box. Rods attached to the eccentric wheel go through slits in the building walls and run at ground level, on special stakes that hold the rods up, to power pumpjacks that pump oil. This rod line system currently has four wells it is powering, but has the capacity to do as many as 17 pumpjacks at one time.