Active noise cancelling and oil well: what they have in common

1. Step 1. Active noise cancelling — is used in — Headphones. Noise-cancelling headphones.
2. Step 2. Headphones — has part — Copper wire. A cable.
3. Step 3. Copper wire — uses — Wire drawing. Drawing.
4. Step 4. Wire drawing — is used in — Wire rope. The wire is drawn.
5. Step 5. Wire rope — is made of — Wrought iron. Albert’s rope (1834) is made of iron wire.
6. Step 6. Wrought iron — is material for — Oil well. The casing pipes are iron.

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