LED lamp and piston pump: what they have in common

1. Step 1. LED lamp — evolved from — Incandescent light bulb. It replaced incandescent bulbs.
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 — Newcomen engine. Condensing the steam creates a vacuum under the piston.
4. Step 4. Newcomen engine — has part — Piston pump. The beam drove a mine pump.

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