Coal gas e pneumatic tube: o que têm em comum

1. Passo 1. Coal gas — é feito de — Carvão mineral. The gas was made by the dry distillation of coal.
2. Passo 2. Carvão mineral — é material para — Aspirina. The raw materials of early pharmaceutical synthesis were products of coal tar distillation.
3. Passo 3. Aspirina — utiliza — Tablet (medicine). Produced as tablets.
4. Passo 4. Tablet (medicine) — funciona como — Cápsula. Dosage forms.
5. Passo 5. Cápsula — faz parte de — Pneumatic tube. A container for letters.

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