Magnetic minesweeping cable and car: what they have in common

1. Step 1. Magnetic minesweeping cable — is part of — Minesweeper. It simulates the ship’s field.
2. Step 2. Minesweeper — has part — Sonar. Searching for mines.
3. Step 3. Sonar — is part of — Submarine. Underwater acoustics.
4. Step 4. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
5. Step 5. Lead–acid battery — includes — Car battery. Lead–acid.
6. Step 6. Car battery — is part of — Car. A battery.

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