Lunar module and conveyor belt: what they have in common

1. Step 1. Lunar module — has part — Landing gear. Legs.
2. Step 2. Landing gear — includes — Retractable landing gear. Landing gear.
3. Step 3. Retractable landing gear — has part — Hydraulic cylinder. Retraction cylinders.
4. Step 4. Hydraulic cylinder — is part of — Tunnel boring machine. Hydraulic cylinders push the machine forward.
5. Step 5. Tunnel boring machine — has part — Conveyor belt. Spoil is removed by a conveyor.

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