Solder and modem: what they have in common

1. Step 1. Solder — is used in — Printed circuit board. Components are soldered on.
2. Step 2. Printed circuit board — is part of — Mobile phone. All of a phone's parts are soldered onto a printed circuit board.
3. Step 3. Mobile phone — evolved from — Telephone. A mobile phone keeps the function of a telephone, replacing the wire with a radio channel.
4. Step 4. Telephone — is used in — Modem. It works over a telephone line.

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