Landmine casing and saw: what they have in common

1. Step 1. Landmine casing — is part of — Landmine. A hull.
2. Step 2. Landmine — uses — Gunpowder. Chinese mines of the 13th century were filled with gunpowder.
3. Step 3. Gunpowder — is used in — Gunpowder mill. Production.
4. Step 4. Gunpowder mill — has part — Water wheel. The drive.
5. Step 5. Water wheel — is part of — Sawmill. Early sawmills were driven by water wheels.
6. Step 6. Sawmill — uses — Saw. The cutting tool is a saw.

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