Punched rod hole e railway semaphore: o que têm em comum

1. Passo 1. Punched rod hole — faz parte de — Index card. It holds the cards in the drawer.
2. Passo 2. Index card — é feito de — Paper. Paper.
3. Passo 3. Paper — é material para — Outdoor. The poster is paper.
4. Passo 4. Outdoor — tem como parte — LED. LED screens.
5. Passo 5. LED — faz parte de — Traffic light. LEDs.
6. Passo 6. Traffic light — evoluiu de — Railway semaphore. The first traffic light was a railway-style semaphore.

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