Lead–acid battery and hollerith tabulator: what they have in common

1. Step 1. Lead–acid battery — uses — Sulfuric acid. The electrolyte.
2. Step 2. Sulfuric acid — is used in — Chemical plant. The first chemical plants produced sulfuric acid and soda.
3. Step 3. Chemical plant — has part — Programmable logic controller. Process control automation.
4. Step 4. Programmable logic controller — evolved from — Relay. It replaced relay cabinets.
5. Step 5. Relay — is part of — Hollerith tabulator. Relays controlled the sorting box.

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