Trowel blade and electric fan: what they have in common

1. Step 1. Trowel blade — is part of — Trowel. A steel plate for mortar.
2. Step 2. Trowel — is used in — Brick. Bricklaying with a trowel.
3. Step 3. Brick — is material for — Water tower. Water towers are brick.
4. Step 4. Water tower — has part — Centrifugal pump. Filled by pumps.
5. Step 5. Centrifugal pump — has part — Impeller. The impeller accelerates the liquid.
6. Step 6. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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