Puddling and joystick: what they have in common

1. Step 1. Puddling — is used in — Wrought iron. The puddling process.
2. Step 2. Wrought iron — is material for — Elevator safety brake. The safety catches are wrought iron.
3. Step 3. Elevator safety brake — has part — Spring. Springs throw out the catches when the rope goes slack.
4. Step 4. Spring — is part of — Joystick. They return the stick to the centre.

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