Screw lamp base e saw: o que têm em comum

1. Passo 1. Screw lamp base — faz parte de — Incandescent light bulb. A screw contact (the Edison base).
2. Passo 2. Incandescent light bulb — evoluiu de — Gas lamp. Electricity displaced gas lighting.
3. Passo 3. Gas lamp — tem como parte — Valve. A gas supply valve.
4. Passo 4. Valve — faz parte de — Internal combustion engine. Valves let in the mixture and let out the gases.
5. Passo 5. Internal combustion engine — faz parte de — Motosserra. A two-stroke engine.
6. Passo 6. Motosserra — evoluiu de — Saw. A mechanized saw.

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