Wrench and dewar flask: what they have in common

1. Step 1. Wrench — is made of — Wrought iron. Wrenches are wrought iron.
2. Step 2. Wrought iron — is material for — Oil well. The casing pipes are iron.
3. Step 3. Oil well — is used in — Crude oil. Oil is extracted from wells.
4. Step 4. Crude oil — is used in — Tanker. It carries oil.
5. Step 5. Tanker — includes — LNG carrier. A tanker.
6. Step 6. LNG carrier — has part — Dewar flask. Insulated tanks.

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