I-beam and dewar flask: what they have in common

1. Step 1. I-beam — uses — Rolling mill. Rolling.
2. Step 2. Rolling mill — is part of — Steel works. Rolling mills.
3. Step 3. Steel works — uses — Air separation. The basic oxygen process uses industrial oxygen.
4. Step 4. Air separation — uses — Cryogenics. Liquefaction.
5. Step 5. Cryogenics — is used in — Liquid nitrogen. Liquefaction.
6. Step 6. Liquid nitrogen — is used in — Dewar flask. Storage.

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