Space helmet with visor e telephone: o que têm em comum

1. Passo 1. Space helmet with visor — faz parte de — Spacesuit. A transparent helmet with a light filter.
2. Passo 2. Spacesuit — é feito de — Vulcanized rubber. The pressure bladder is rubber.
3. Passo 3. Vulcanized rubber — é material para — Tyre tread. The tread is rubber.
4. Passo 4. Tyre tread — é feito de — Carbono. With carbon black for strength.
5. Passo 5. Carbono — é material para — Hearing aid. The first hearing aids used a carbon microphone.
6. Passo 6. Hearing aid — evoluiu de — Telephone. The first electric hearing aids were built from telephone components.

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