District heating and screw press: what they have in common

1. Step 1. District heating — uses — Centrifugal pump. Network pumps.
2. Step 2. Centrifugal pump — is part of — Fire truck. A fire pump.
3. Step 3. Fire truck — has part — Ladder. An extending ladder.
4. Step 4. Ladder — uses — Inclined plane. Climbing to a height.
5. Step 5. Inclined plane — evolved into — Screw. A screw is an inclined plane wrapped around a cylinder.
6. Step 6. Screw — is used in — Screw press. The force is produced by turning a screw.

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