Oil lamp and vacuum pump: what they have in common

1. Step 1. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
2. Step 2. Incandescent light bulb — uses — Vacuum. The bulb was evacuated so the filament would not burn out.
3. Step 3. Vacuum — is used in — Vacuum pump. The pump creates a vacuum.

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