Time-sharing and atomic clock: what they have in common

1. Step 1. Time-sharing — uses — Mainframe. Multi-user mainframes.
2. Step 2. Mainframe — has part — Magnetic-core memory. Magnetic-core memory.
3. Step 3. Magnetic-core memory — evolved into — RAM. DRAM displaced core memory.
4. Step 4. RAM — has part — Capacitor. A DRAM bit is stored in a tiny capacitor.
5. Step 5. Capacitor — is part of — Oscillator. An LC circuit.
6. Step 6. Oscillator — is part of — Atomic clock. A quartz oscillator is tuned to the atoms.

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