Motosserra e electrical telegraph: o que têm em comum

1. Passo 1. Motosserra — tem como parte — Roller chain. The cutting chain is a roller chain with teeth.
2. Passo 2. Roller chain — faz parte de — Roller coaster. A chain lift.
3. Passo 3. Roller coaster — utiliza — Railway track. Rails.
4. Passo 4. Railway track — inspirou — Time zones. Introduced because of railway timetables.
5. Passo 5. Time zones — utiliza — Electrical telegraph. Synchronizing time by telegraph.

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