Front-mounted pedal crank and electrical telegraph: what they have in common

1. Step 1. Front-mounted pedal crank — is part of — Recumbent bicycle. Pedals at the front.
2. Step 2. Recumbent bicycle — has part — Roller chain. The drive is by chain.
3. Step 3. Roller chain — is part of — Roller coaster. A chain lift.
4. Step 4. Roller coaster — uses — Railway track. Rails.
5. Step 5. Railway track — inspired — Time zones. Introduced because of railway timetables.
6. Step 6. Time zones — uses — Electrical telegraph. Synchronizing time by telegraph.

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