Means of communication e saw: o que têm em comum

1. Passo 1. Means of communication — inclui — Optical telegraph. A means of communication.
2. Passo 2. Optical telegraph — utiliza — Lens. Signals were read through telescopes.
3. Passo 3. Lens — faz parte de — Cinematógrafo. A lens.
4. Passo 4. Cinematógrafo — tem como parte — Manivela. The film was advanced by turning a handle.
5. Passo 5. Manivela — faz parte de — Sawmill. A crank turns the wheel’s rotation into the stroke of the saw.
6. Passo 6. Sawmill — utiliza — Saw. The cutting tool is a saw.

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