Rebar and electrical telegraph: what they have in common

1. Step 1. Rebar — is part of — Reinforced concrete. Reinforcement.
2. Step 2. Reinforced concrete — is material for — Sleeper. Reinforced concrete sleepers.
3. Step 3. Sleeper — is part of — Railway track. Sleepers.
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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