Fuel injection and incandescent light bulb: what they have in common

1. Step 1. Fuel injection — evolved from — Carburettor. Fuel injection replaced carburettors.
2. Step 2. Carburettor — has part — Valve. A throttle valve in the carburettor sets how much fuel-air mix reaches the engine.
3. Step 3. Valve — is part of — Gas lamp. A gas supply valve.
4. Step 4. Gas lamp — evolved into — Incandescent light bulb. Electricity displaced gas lighting.

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