Oil lamp und vacuum pump: was sie gemeinsam haben

1. Schritt 1. Oil lamp — entwickelte sich zu — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
2. Schritt 2. Incandescent light bulb — nutzt — Vacuum. The bulb was evacuated so the filament would not burn out.
3. Schritt 3. Vacuum — wird verwendet in — Vacuum pump. The pump creates a vacuum.

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