Rubber band strap and screw press: what they have in common

1. Step 1. Rubber band strap — is part of — Tourniquet. An elastic band.
2. Step 2. Tourniquet — has part — Screw thread. Petit’s tourniquet was tightened with a screw.
3. Step 3. Screw thread — evolved from — Screw. A thread is an application of the screw.
4. Step 4. Screw — is used in — Screw press. The force is produced by turning a screw.

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