My clipper works with a DC motor attached to an eccentric which moves the clipper back and forth. I have an old clipper that works like the one linked, but it is noisy (especially if used on a 50hz circuit with a step-down transformer), and not better than the DC one: a mechanism with higher torque might make it possible to cut with duller blades, but that isn’t an advantage when the thing you’re cutting is attached to your skin.
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