Mainspring e rolling mill: o que têm em comum

1. Passo 1. Mainspring — faz parte de — Gramophone. A spring drive.
2. Passo 2. Gramophone — evoluiu de — Phonograph. A flat disc instead of a cylinder.
3. Passo 3. Phonograph — é feito de — Tin. The recording is on tin foil.
4. Passo 4. Tin — é material para — Model railway. The first models were tinplate.
5. Passo 5. Model railway — utiliza — Railway track. It runs on rails.
6. Passo 6. Railway track — utiliza — Rolling mill. Rails are rolled.

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