Gyrocompass and shipping container: what they have in common

1. Step 1. Gyrocompass — evolved from — Compass. A compass without a magnet.
2. Step 2. Compass — is part of — Sailing ship. A magnetic compass.
3. Step 3. Sailing ship — is used in — Seaport. A port receives ships.
4. Step 4. Seaport — has part — Container crane. Container cranes.
5. Step 5. Container crane — uses — Shipping container. It moves containers.

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