Mainspring and internal combustion engine: what they have in common

1. Step 1. Mainspring — is part of — Gramophone. A spring drive.
2. Step 2. Gramophone — evolved from — Phonograph. A flat disc instead of a cylinder.
3. Step 3. Phonograph — uses — Sound wave. It records sound vibrations as a groove.
4. Step 4. Sound wave — is used in — Silencer. It damps sound waves.
5. Step 5. Silencer — is part of — Internal combustion engine. A silencer.

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