Rotation axle and bellows: what they have in common

1. Step 1. Rotation axle — is part of — Anemometer. A vertical axis.
2. Step 2. Anemometer — is part of — Weather station. An anemometer.
3. Step 3. Weather station — has part — Barometer. A barometer.
4. Step 4. Barometer — uses — Pressure. It measures pressure.
5. Step 5. Pressure — is used in — Bellows. Bellows push air by pressure.

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