Suspension bridge and hollerith tabulator: what they have in common

1. Step 1. Suspension bridge — has part — Wire rope. Load-bearing cables.
2. Step 2. Wire rope — uses — Wire drawing. The wire is drawn.
3. Step 3. Wire drawing — is used in — Copper wire. Drawing.
4. Step 4. Copper wire — is part of — Magnetic-core memory. Wires threaded through them.
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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