Refrigerator and Babbage’s Analytical Engine: what they have in common

1. Step 1. Refrigerator — is used in — Supermarket. Refrigerated displays.
2. Step 2. Supermarket — uses — Cash register. Tills.
3. Step 3. Cash register — has part — Gear. A counting mechanism of gears.
4. Step 4. Gear — is part of — Babbage’s Analytical Engine. Gears performed the calculations.

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