One manufacturing technology for starters was to have a lever that under the electrical impulse of the relay activated the starter to drive the ring gear.

Then another one was created and implemented by Chrysler, using a gearing system via the epicyclic gear or clutch to advance the starter. There is a whole set of ring gear or gearwheel depending on the model.

This is present on starter models such as Denso, Hitachi, among others on Kubota and Yanmar assemblies.

Bosch to also use the planetary gear on some starter models.