Barcode scanner and newcomen engine: what they have in common

1. Step 1. Barcode scanner — is part of — Self-checkout. It reads the goods.
2. Step 2. Self-checkout — evolved from — Cash register. A till.
3. Step 3. Cash register — is made of — Cast iron. Ritty’s registers had a cast-iron body.
4. Step 4. Cast iron — is material for — Newcomen engine. The cylinder is cast iron.

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