Glass light bulb envelope e tunnelling shield: o que têm em comum

1. Passo 1. Glass light bulb envelope — faz parte de — Incandescent light bulb. A glass bulb with a vacuum or inert gas.
2. Passo 2. Incandescent light bulb — evoluiu de — Gas lamp. Electricity displaced gas lighting.
3. Passo 3. Gas lamp — evoluiu para — Street light. Gas lamps.
4. Passo 4. Street light — faz parte de — Tunnel. Lighting.
5. Passo 5. Tunnel — utiliza — Tunnelling shield. Shield tunnelling.

Abrir Evothings