By rotating the main moving case, a pinion gear rotates in a circle astride both internal gears that have the same pitch circumference and different teeth number. When the main moving case makes one revolution, a rotation angle differential for teeth number differences of two internal gears is generated
By setting on a handle or shaft, a rotation speed can be specified. There are a "Weight type" with movable needle and "Differential type" with movable dial. It has high functions with artistic appearance.
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