Condenser microphone and hollerith tabulator: what they have in common

1. Step 1. Condenser microphone — uses — Capacitance. Capacitance.
2. Step 2. Capacitance — is used in — Capacitor. It stores charge thanks to capacitance.
3. Step 3. Capacitor — is part of — RAM. A DRAM bit is stored in a tiny capacitor.
4. Step 4. RAM — evolved from — Magnetic-core memory. DRAM displaced core memory.
5. Step 5. Magnetic-core memory — is part of — Mainframe. Magnetic-core memory.
6. Step 6. Mainframe — evolved from — Hollerith tabulator. IBM grew out of Hollerith’s company.

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