Seaport and conveyor belt: what they have in common

1. Step 1. Seaport — has part — Container crane. Container cranes.
2. Step 2. Container crane — has part — Wire rope. Cables.
3. Step 3. Wire rope — is part of — Cable car. A cable.
4. Step 4. Cable car — has part — Pulley. Pulleys.
5. Step 5. Pulley — is part of — Belt drive. The belt wraps around pulleys.
6. Step 6. Belt drive — is used in — Conveyor belt. The belt runs around the drive and tension drums.

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