Lâmpada de arco e rock drill: o que têm em comum

1. Passo 1. Lâmpada de arco — faz parte de — Street light. The first electric street lights were arc lamps (the “Yablochkov candle”, 1878).
2. Passo 2. Street light — faz parte de — Tunnel. Lighting.
3. Passo 3. Tunnel — utiliza — Rock drill. Driving the Mont Cenis tunnel.

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