Padlock body and modem: what they have in common

1. Step 1. Padlock body — is part of — Padlock. A case with the mechanism.
2. Step 2. Padlock — has part — Spring. The mechanism’s springs.
3. Step 3. Spring — is part of — Rotary dial. A return spring.
4. Step 4. Rotary dial — is part of — Telephone. A dial.
5. Step 5. Telephone — is used in — Modem. It works over a telephone line.

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