Safety razor and lathe: what they have in common

1. Step 1. Safety razor — has part — Handle. A handle.
2. Step 2. Handle — is part of — Screwdriver. A handle.
3. Step 3. Screwdriver — uses — Screw thread. It drives screws.
4. Step 4. Screw thread — is used in — Screw-cutting lathe. The lathe cuts precise standard threads.
5. Step 5. Screw-cutting lathe — evolved from — Lathe. Maudslay added a lead screw and a slide rest.

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