Wallet bill compartment and electric motor: what they have in common

1. Step 1. Wallet bill compartment — is part of — Wallet. A long pocket.
2. Step 2. Wallet — is made of — Leather. Leather.
3. Step 3. Leather — is material for — Conveyor belt. The first belts were leather.
4. Step 4. Conveyor belt — is part of — Tunnel boring machine. Spoil is removed by a conveyor.
5. Step 5. Tunnel boring machine — has part — Electric motor. Electric motors turn the cutting heads.

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