V-2 rocket and tunnelling shield: what they have in common

1. Step 1. V-2 rocket — evolved into — Saturn V. Von Braun went from the V-2 to the Saturn.
2. Step 2. Saturn V — uses — Lunar module. It launched the lunar module.
3. Step 3. Lunar module — has part — Landing gear. Legs.
4. Step 4. Landing gear — includes — Retractable landing gear. Landing gear.
5. Step 5. Retractable landing gear — has part — Hydraulic cylinder. Retraction cylinders.
6. Step 6. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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