Combine harvester and voltaic pile: what they have in common

1. Step 1. Combine harvester — has part — Diesel engine. Self-propelled combines run on diesels.
2. Step 2. Diesel engine — is part of — Submarine. Diesel-electric submarines.
3. Step 3. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
4. Step 4. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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