Steel cord and headphones: what they have in common

1. Step 1. Steel cord — is part of — Radial tyre. Steel cord.
2. Step 2. Radial tyre — is a kind of — Pneumatic tyre. A kind of tyre.
3. Step 3. Pneumatic tyre — is part of — Electric car. An electric car’s wheels have pneumatic tyres.
4. Step 4. Electric car — has part — Neodymium magnet. Synchronous traction motors use neodymium magnets.
5. Step 5. Neodymium magnet — is a kind of — Permanent magnet. A kind of magnet.
6. Step 6. Permanent magnet — is part of — Headphones. A magnet moves the diaphragm.

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