Truss bridge and hammer: what they have in common

1. Step 1. Truss bridge — uses — Railway track. Railway bridges.
2. Step 2. Railway track — uses — Rolling mill. Rails are rolled.
3. Step 3. Rolling mill — uses — Water wheel. The first mills were turned by water.
4. Step 4. Water wheel — is part of — Trip hammer. The shaft was turned by a water wheel.
5. Step 5. Trip hammer — evolved from — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.

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