Inflatable catheter balloon und railway track: was sie gemeinsam haben

1. Schritt 1. Inflatable catheter balloon — ist Teil von — Katheter. It inflates and holds the catheter in place.
2. Schritt 2. Katheter — ist Teil von — IV drip. A catheter.
3. Schritt 3. IV drip — nutzt — Gravity flow. The solution flows under gravity.
4. Schritt 4. Gravity flow — wird verwendet in — Water wheel. Falling or flowing water turns the wheel.
5. Schritt 5. Water wheel — wird verwendet in — Rolling mill. The first mills were turned by water.
6. Schritt 6. Rolling mill — wird verwendet in — Railway track. Rails are rolled.

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