Magnetic minesweeping cable e rolling mill: o que têm em comum

1. Passo 1. Magnetic minesweeping cable — faz parte de — Minesweeper. It simulates the ship’s field.
2. Passo 2. Minesweeper — utiliza — Landmine. Against sea mines.
3. Passo 3. Landmine — utiliza — Gunpowder. Chinese mines of the 13th century were filled with gunpowder.
4. Passo 4. Gunpowder — é utilizado em — Gunpowder mill. Production.
5. Passo 5. Gunpowder mill — tem como parte — Water wheel. The drive.
6. Passo 6. Water wheel — é utilizado em — Rolling mill. The first mills were turned by water.

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