Result register and fuel cell: what they have in common

1. Step 1. Result register — is part of — Arithmometer. The carriage with the result.
2. Step 2. Arithmometer — evolved into — Electronic calculator. Electronics replaced mechanics.
3. Step 3. Electronic calculator — has part — Alkaline battery. A calculator runs on a battery, sometimes on a tiny solar panel.
4. Step 4. Alkaline battery — uses — Electrochemical reaction. An electrochemical reaction.
5. Step 5. Electrochemical reaction — is used in — Fuel cell. The reaction runs electrochemically, without combustion.

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