Suspension and sonar: what they have in common

1. Step 1. Suspension — includes — Torsion bar suspension. Torsion bar suspension is a kind of suspension.
2. Step 2. Torsion bar suspension — is part of — Tank. The road wheels of many tanks are sprung on torsion bars.
3. Step 3. Tank — has part — Periscope. Observation devices.
4. Step 4. Periscope — is part of — Submarine. A periscope.
5. Step 5. Submarine — has part — Sonar. Underwater acoustics.

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