Newcomen engine and micrometer: what they have in common

1. Step 1. Newcomen engine — has part — Piston pump. The beam drove a mine pump.
2. Step 2. Piston pump — is part of — Jack. A hand plunger pump.
3. Step 3. Jack — uses — Screw. A screw jack.
4. Step 4. Screw — is used in — Micrometer. A precise screw with a 0.5 mm pitch.

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