Mine hoist and pneumatic tube: what they have in common

1. Step 1. Mine hoist — is part of — Coal mine. Hoisting.
2. Step 2. Coal mine — is used in — Coal. Extraction.
3. Step 3. Coal — is material for — Aspirin. The raw materials of early pharmaceutical synthesis were products of coal tar distillation.
4. Step 4. Aspirin — uses — Tablet (medicine). Produced as tablets.
5. Step 5. Tablet (medicine) — works like — Capsule. Dosage forms.
6. Step 6. Capsule — is part of — Pneumatic tube. A container for letters.

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