Tourniquet and piston pump: what they have in common

1. Step 1. Tourniquet — has part — Screw thread. Petit’s tourniquet was tightened with a screw.
2. Step 2. Screw thread — evolved from — Screw. A thread is an application of the screw.
3. Step 3. Screw — is used in — Jack. A screw jack.
4. Step 4. Jack — has part — Piston pump. A hand plunger pump.

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