Container doors with locking bars and sonar: what they have in common

1. Step 1. Container doors with locking bars — is part of — Shipping container. End doors.
2. Step 2. Shipping container — is used in — Container ship. Carries standard containers.
3. Step 3. Container ship — has part — Diesel engine. A slow-speed diesel.
4. Step 4. Diesel engine — is part of — Submarine. Diesel-electric submarines.
5. Step 5. Submarine — has part — Sonar. Underwater acoustics.

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