Cobalt and davy lamp: what they have in common

1. Step 1. Cobalt — is material for — Cemented carbide. A cobalt binder.
2. Step 2. Cemented carbide — is made of — Tungsten. Tungsten carbide.
3. Step 3. Tungsten — is material for — Incandescent light bulb. A tungsten filament (since 1904–1910).
4. Step 4. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.
5. Step 5. Oil lamp — has part — Wick. The wick feeds oil to the flame.
6. Step 6. Wick — is part of — Davy lamp. A wick.

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