Audiometer and hollerith tabulator: what they have in common

1. Step 1. Audiometer — has part — Headphones. Headphones.
2. Step 2. Headphones — has part — Copper wire. A cable.
3. Step 3. Copper wire — is part of — Magnetic-core memory. Wires threaded through them.
4. Step 4. Magnetic-core memory — is part of — Mainframe. Magnetic-core memory.
5. Step 5. Mainframe — evolved from — Hollerith tabulator. IBM grew out of Hollerith’s company.

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