woodlink slot and pin pole system
Pancake (slot car) - Wikipedia
3-phase motors are a common type of motor. The most basic 3-phase brushless motor is a 2-pole 3-slot motor. There are various combinations such as 4-pole 3-slot, 4-pole 6-slot, and 16-pole 12-slot.
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Antikythera mechanism
The Geneva mechanism is described as a timing device that translates continuous rotation into intermittent rotary motion using a pin and slot system.