Time-sharing and fitness tracker: what they have in common

1. Step 1. Time-sharing — uses — Mainframe. Multi-user mainframes.
2. Step 2. Mainframe — has part — Integrated circuit. The hybrid circuits of the System/360.
3. Step 3. Integrated circuit — includes — System on a chip (SoC). An SoC is a very complex integrated circuit.
4. Step 4. System on a chip (SoC) — is part of — Smartwatch. Inside is a system on a chip.
5. Step 5. Smartwatch — evolved from — Fitness tracker. Tracker functions moved into watches.

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