Bag and micrometer: what they have in common

1. Step 1. Bag — is made of — Leather. Leather.
2. Step 2. Leather — is material for — Tourniquet. The strap of a tourniquet is leather.
3. Step 3. Tourniquet — has part — Screw thread. Petit’s tourniquet was tightened with a screw.
4. Step 4. Screw thread — evolved from — Screw. A thread is an application of the screw.
5. Step 5. Screw — is used in — Micrometer. A precise screw with a 0.5 mm pitch.

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