Wire drawing and electric fan: what they have in common

1. Step 1. Wire drawing — is used in — Wire rope. The wire is drawn.
2. Step 2. Wire rope — is part of — Mine hoist. Mine ropes were the first use of wire rope.
3. Step 3. Mine hoist — is part of — Coal mine. Hoisting.
4. Step 4. Coal mine — uses — Mine ventilation. Airing the workings.
5. Step 5. Mine ventilation — has part — Electric fan. Fans.

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