Fretted guitar neck and smart meter: what they have in common

1. Step 1. Fretted guitar neck — is part of — Guitar. Frets set the pitch of the notes.
2. Step 2. Guitar — evolved into — Electric guitar. Electrification.
3. Step 3. Electric guitar — has part — Pickup. Pickups.
4. Step 4. Pickup — has part — Permanent magnet. A magnet magnetizes the string.
5. Step 5. Permanent magnet — is part of — Electricity meter. A braking magnet.
6. Step 6. Electricity meter — evolved into — Smart meter. A digital meter.

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