Spinning jenny and electronic calculator: what they have in common

1. Step 1. Spinning jenny — evolved from — Spinning wheel. Many spindles driven by one wheel.
2. Step 2. Spinning wheel — has part — Crank. A foot drive through a crank.
3. Step 3. Crank — is part of — Arithmometer. The handle for adding and subtracting.
4. Step 4. Arithmometer — evolved into — Electronic calculator. Electronics replaced mechanics.

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