Screw-cutting lathe and submarine: what they have in common

1. Step 1. Screw-cutting lathe — uses — Screw thread. The lathe cuts precise standard threads.
2. Step 2. Screw thread — is part of — Tourniquet. Petit’s tourniquet was tightened with a screw.
3. Step 3. Tourniquet — is made of — Leather. The strap of a tourniquet is leather.
4. Step 4. Leather — is material for — Submarine. It was covered with leather.

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