Mechanical sweep cable and steam locomotive: what they have in common

1. Step 1. Mechanical sweep cable — is part of — Minesweeper. It cuts the mine moorings.
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 — Diesel engine. Diesel-electric submarines.
5. Step 5. Diesel engine — is part of — Diesel locomotive. The diesel turns a generator.
6. Step 6. Diesel locomotive — evolved from — Steam locomotive. It replaced the steam locomotive.

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