Telephone exchange and data centre: what they have in common

1. Step 1. Telephone exchange — has part — Strowger switch. Automatic selectors.
2. Step 2. Strowger switch — has part — Electromagnet. Electromagnetic stepping mechanisms.
3. Step 3. Electromagnet — is part of — Cyclotron. A magnet.
4. Step 4. Cyclotron — evolved into — Large Hadron Collider. Ring accelerators.
5. Step 5. Large Hadron Collider — uses — Data centre. A grid for processing data.

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