Portal crane and conveyor belt: what they have in common

1. Step 1. Portal crane — is a kind of — Tower crane. A crane.
2. Step 2. Tower crane — has part — Block and tackle. The load is lifted with a block and tackle.
3. Step 3. Block and tackle — has part — Pulley. A block and tackle is several pulleys and a rope.
4. Step 4. Pulley — is part of — Belt drive. The belt wraps around pulleys.
5. Step 5. Belt drive — is used in — Conveyor belt. The belt runs around the drive and tension drums.

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