Screwdriver tip and bellows: what they have in common

1. Step 1. Screwdriver tip — is part of — Screwdriver. A flat or cross-shaped tip.
2. Step 2. Screwdriver — uses — Screw thread. It drives screws.
3. Step 3. Screw thread — is part of — Tourniquet. Petit’s tourniquet was tightened with a screw.
4. Step 4. Tourniquet — is made of — Leather. The strap of a tourniquet is leather.
5. Step 5. Leather — is material for — Bellows. Bellows are a leather bag.

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