Kerosene lamp and watt steam engine: what they have in common

1. Step 1. Kerosene lamp — has part — Wick. A wick.
2. Step 2. Wick — is part of — Davy lamp. A wick.
3. Step 3. Davy lamp — is used in — Coal mine. Protection against methane explosions.
4. Step 4. Coal mine — has part — Mine hoist. Hoisting.
5. Step 5. Mine hoist — has part — Watt steam engine. Steam winding engines.

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