Container corner castings and headphones: what they have in common

1. Step 1. Container corner castings — is part of — Shipping container. Standard corner fittings for cranes and securing.
2. Step 2. Shipping container — is used in — Container crane. It moves containers.
3. Step 3. Container crane — has part — Wire rope. Cables.
4. Step 4. Wire rope — uses — Wire drawing. The wire is drawn.
5. Step 5. Wire drawing — is used in — Copper wire. Drawing.
6. Step 6. Copper wire — is part of — Headphones. A cable.

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