Continuous casting and electrical telegraph: what they have in common

1. Step 1. Continuous casting — is used in — Steel works. Casting.
2. Step 2. Steel works — has part — Rolling mill. Rolling mills.
3. Step 3. Rolling mill — is used in — Railway track. Rails are rolled.
4. Step 4. Railway track — inspired — Time zones. Introduced because of railway timetables.
5. Step 5. Time zones — uses — Electrical telegraph. Synchronizing time by telegraph.

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