Air suspension and telephone: what they have in common

1. Step 1. Air suspension — is a kind of — Suspension. Suspension.
2. Step 2. Suspension — has part — Spring. Springs are the elastic element of the suspension.
3. Step 3. Spring — is part of — Rotary dial. A return spring.
4. Step 4. Rotary dial — is part of — Telephone. A dial.

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