Bow and arrow and conveyor belt: what they have in common

1. Step 1. Bow and arrow — has part — Rope. The bowstring is a cord of sinew or fibre.
2. Step 2. Rope — is used in — Pulley. A rope runs over the pulley.
3. Step 3. Pulley — is part of — Belt drive. The belt wraps around pulleys.
4. Step 4. Belt drive — is used in — Conveyor belt. The belt runs around the drive and tension drums.

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