Tablet film coating e railway semaphore: o que têm em comum

1. Passo 1. Tablet film coating — faz parte de — Tablet (medicine). A film coating.
2. Passo 2. Tablet (medicine) — é utilizado em — Aspirina. Produced as tablets.
3. Passo 3. Aspirina — é feito de — Carvão mineral. The raw materials of early pharmaceutical synthesis were products of coal tar distillation.
4. Passo 4. Carvão mineral — é material para — Coal gas. The gas was made by the dry distillation of coal.
5. Passo 5. Coal gas — é utilizado em — Traffic light. A gas lamp lit the signal.
6. Passo 6. Traffic light — evoluiu de — Railway semaphore. The first traffic light was a railway-style semaphore.

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