Cobre e telescope: o que têm em comum

1. Passo 1. Cobre — é material para — Electrical telegraph. The wires are copper and iron.
2. Passo 2. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.
3. Passo 3. Optical telegraph — utiliza — Telescope. Signals were read through a telescope.

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