Rear cargo ramp and fuel cell: what they have in common

1. Step 1. Rear cargo ramp — is part of — Cargo aircraft. A lowering rear ramp for loading vehicles.
2. Step 2. Cargo aircraft — has part — Landing gear. Landing gear for dirt airstrips.
3. Step 3. Landing gear — is part of — Lunar module. Legs.
4. Step 4. Lunar module — is used in — Saturn V. It launched the lunar module.
5. Step 5. Saturn V — uses — Hydrogen. Hydrogen stages.
6. Step 6. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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