Radioisotope generator and monitor: what they have in common

1. Step 1. Radioisotope generator — is part of — Space probe. The Voyagers’ RTGs.
2. Step 2. Space probe — has part — Radio module and antenna. Communication with Earth.
3. Step 3. Radio module and antenna — is part of — Mobile phone. The radio part that talks to the base station.
4. Step 4. Mobile phone — has part — Display. The phone's screen shows the number, messages and menus.
5. Step 5. Display — is part of — Monitor. The heart of a monitor is the display: an LCD panel, once a picture tube.

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