Computing device and lead–acid battery: what they have in common

1. Step 1. Computing device — includes — Turing’s Bombe. A computing device.
2. Step 2. Turing’s Bombe — has part — Relay. Electromechanics.
3. Step 3. Relay — evolved into — Programmable logic controller. It replaced relay cabinets.
4. Step 4. Programmable logic controller — is part of — Chemical plant. Process control automation.
5. Step 5. Chemical plant — uses — Sulfuric acid. The first chemical plants produced sulfuric acid and soda.
6. Step 6. Sulfuric acid — is used in — Lead–acid battery. The electrolyte.

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