Torsion bar suspension and gyroscope: what they have in common

1. Step 1. Torsion bar suspension — is part of — Tank. The road wheels of many tanks are sprung on torsion bars.
2. Step 2. Tank — has part — Armour. Armour protects the crew.
3. Step 3. Armour — is part of — Ironclad. An armour belt.
4. Step 4. Ironclad — has part — Gyrocompass. Steel ships distort a magnetic compass.
5. Step 5. Gyrocompass — has part — Gyroscope. A gyroscope.

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