Synchromesh and voltaic pile: what they have in common

1. Step 1. Synchromesh — is part of — Manual gearbox. Synchronizers.
2. Step 2. Manual gearbox — is a kind of — Transmission (gearbox). A gearbox.
3. Step 3. Transmission (gearbox) — is part of — Car. The gearbox matches engine speed to the wheels.
4. Step 4. Car — has part — Car battery. A battery.
5. Step 5. Car battery — is a kind of — Lead–acid battery. Lead–acid.
6. Step 6. 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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