Radial tyre and centrifugal pump: what they have in common

1. Step 1. Radial tyre — is a kind of — Pneumatic tyre. A kind of tyre.
2. Step 2. Pneumatic tyre — is part of — Landing gear. Aircraft tyres.
3. Step 3. Landing gear — is part of — Lunar module. Legs.
4. Step 4. Lunar module — has part — Liquid-propellant rocket engine. A descent engine.
5. Step 5. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.

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