Rotation mechanism and shipping container: what they have in common

1. Step 1. Rotation mechanism — is part of — Lighthouse. It rotates the optics, setting the flash pattern.
2. Step 2. Lighthouse — is part of — Seaport. A lighthouse.
3. Step 3. Seaport — has part — Container crane. Container cranes.
4. Step 4. Container crane — uses — Shipping container. It moves containers.

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