Chart recorder and boiler: what they have in common

1. Step 1. Chart recorder — is part of — Echo sounder. It records the depth.
2. Step 2. Echo sounder — evolved into — Sonar. Echolocation.
3. Step 3. Sonar — is part of — Destroyer. Underwater acoustics.
4. Step 4. Destroyer — has part — Steam turbine. Turbines.
5. Step 5. Steam turbine — has part — Boiler. Steam from the boiler.

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