Pipe organ e voltaic pile: o que têm em comum

1. Passo 1. Pipe organ — tem como parte — Keyboard. Manuals were the first keyboards.
2. Passo 2. Keyboard — faz parte de — Laptop. The keyboard is built into the laptop's case.
3. Passo 3. Laptop — tem como parte — Lithium-ion battery. A battery.
4. Passo 4. Lithium-ion battery — evoluiu de — Lead–acid battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.
5. Passo 5. Lead–acid battery — evoluiu de — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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