Concrete mixer and saw: what they have in common

1. Step 1. Concrete mixer — uses — Concrete. It mixes concrete.
2. Step 2. Concrete — is material for — Silo. Later — concrete.
3. Step 3. Silo — has part — Bucket elevator. Loading.
4. Step 4. Bucket elevator — has part — Roller chain. A chain or a belt.
5. Step 5. Roller chain — is part of — Chainsaw. The cutting chain is a roller chain with teeth.
6. Step 6. Chainsaw — evolved from — Saw. A mechanized saw.

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