MESM e rock drill: o que têm em comum

1. Passo 1. MESM — tem como parte — Vacuum tube. About 6,000 vacuum tubes.
2. Passo 2. Vacuum tube — evoluiu para — Diodo. The first diode was a vacuum tube (Fleming); later diodes became semiconductor devices.
3. Passo 3. Diodo — inclui — LED. A light-emitting diode.
4. Passo 4. LED — faz parte de — Street light. LEDs.
5. Passo 5. Street light — faz parte de — Tunnel. Lighting.
6. Passo 6. Tunnel — utiliza — Rock drill. Driving the Mont Cenis tunnel.

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