Lighthouse lamp e rock drill: o que têm em comum

1. Passo 1. Lighthouse lamp — faz parte de — Lighthouse. The lamp: oil, kerosene, then electricity.
2. Passo 2. Lighthouse — tem como parte — Rotation mechanism. It rotates the optics, setting the flash pattern.
3. Passo 3. Rotation mechanism — faz parte de — Rock drill. It rotates the rod between blows.

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