Winding windlass and autoclave: what they have in common

1. Step 1. Winding windlass — is part of — Catapult. It draws the lever.
2. Step 2. Catapult — uses — Elasticity. A torsion catapult stored energy in twisted skeins.
3. Step 3. Elasticity — is used in — Spring. A spring works through the elasticity of its material.
4. Step 4. Spring — is part of — Safety valve. A spring-loaded valve.
5. Step 5. Safety valve — is part of — Autoclave. A safety valve releases pressure.

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