Meat grinder and hollerith tabulator: what they have in common

1. Step 1. Meat grinder — has part — Crank. A handle.
2. Step 2. Crank — evolved into — Starter motor. It replaced the starting crank.
3. Step 3. Starter motor — uses — Electromagnetism. A starter is an electric motor.
4. Step 4. Electromagnetism — is used in — Hollerith tabulator. The counters click with electromagnets.

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