Tubing string and tank: what they have in common

1. Step 1. Tubing string — is part of — Oil well. Oil rises through them.
2. Step 2. Oil well — uses — Drilling rig. A well is drilled by a rig.
3. Step 3. Drilling rig — has part — Diesel engine. The drive.
4. Step 4. Diesel engine — is part of — Tank. Most modern tanks are powered by a diesel (the Mark I had a petrol engine).

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