Front-mounted pedal crank and sewage treatment plant: what they have in common

1. Step 1. Front-mounted pedal crank — is part of — Recumbent bicycle. Pedals at the front.
2. Step 2. Recumbent bicycle — has part — Roller chain. The drive is by chain.
3. Step 3. Roller chain — is part of — Bucket elevator. A chain or a belt.
4. Step 4. Bucket elevator — is part of — Silo. Loading.
5. Step 5. Silo — is made of — Concrete. Later — concrete.
6. Step 6. Concrete — is material for — Sewage treatment plant. The tanks are concrete.

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