Telephone and monitor: what they have in common

1. Step 1. Telephone — evolved into — Mobile phone. A mobile phone keeps the function of a telephone, replacing the wire with a radio channel.
2. Step 2. Mobile phone — has part — Display. The phone's screen shows the number, messages and menus.
3. Step 3. Display — is part of — Monitor. The heart of a monitor is the display: an LCD panel, once a picture tube.

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