Overhead crane and zip: what they have in common

1. Step 1. Overhead crane — has part — Beam. An overhead crane runs along a beam bridge under the workshop roof.
2. Step 2. Beam — is part of — Truss. Members.
3. Step 3. Truss — is part of — Eiffel Tower. Lattice trusses.
4. Step 4. Eiffel Tower — has part — Rivet. 2.5 million rivets.
5. Step 5. Rivet — is part of — Jeans. Copper rivets on the pockets.
6. Step 6. Jeans — has part — Zip. A zip.

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