Tablet film coating und railway semaphore: was sie gemeinsam haben

1. Schritt 1. Tablet film coating — ist Teil von — Tablet (medicine). A film coating.
2. Schritt 2. Tablet (medicine) — wird verwendet in — Aspirin. Produced as tablets.
3. Schritt 3. Aspirin — ist hergestellt aus — Kohle. The raw materials of early pharmaceutical synthesis were products of coal tar distillation.
4. Schritt 4. Kohle — ist Material für — Coal gas. The gas was made by the dry distillation of coal.
5. Schritt 5. Coal gas — wird verwendet in — Traffic light. A gas lamp lit the signal.
6. Schritt 6. Traffic light — entwickelte sich aus — Railway semaphore. The first traffic light was a railway-style semaphore.

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