Shield boss and shipping container: what they have in common

1. Step 1. Shield boss — is part of — Shield. A metal plate above the handle.
2. Step 2. Shield — is made of — Leather. Leather on a wooden base.
3. Step 3. Leather — is material for — Carriage. The suspension of early carriages was leather straps.
4. Step 4. Carriage — has part — Leaf spring. Leaf springs softened the ride of carriages.
5. Step 5. Leaf spring — is part of — Truck. Leaf-spring suspension.
6. Step 6. Truck — uses — Shipping container. A container moves from ship to truck without being unloaded.

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