Balance wheel and transformer: what they have in common

1. Step 1. Balance wheel — has part — Spring. A spiral hairspring returns the balance.
2. Step 2. Spring — is part of — Pinball. A plunger.
3. Step 3. Pinball — has part — Electromagnet. Flippers are solenoids.
4. Step 4. Electromagnet — has part — Copper wire. A winding.
5. Step 5. Copper wire — is part of — Transformer. Windings.

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