Bent wire hairpin and telephone: what they have in common

1. Step 1. Bent wire hairpin — is part of — Hairpin. An elastic U-shaped wire.
2. Step 2. Hairpin — uses — Elasticity. Elasticity.
3. Step 3. Elasticity — is used in — Spring. A spring works through the elasticity of its material.
4. Step 4. Spring — is part of — Rotary dial. A return spring.
5. Step 5. Rotary dial — is part of — Telephone. A dial.

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