Folding frame hinge and tunnelling shield: what they have in common

1. Step 1. Folding frame hinge — is part of — Folding bicycle. It folds the frame in half.
2. Step 2. Folding bicycle — has part — Bicycle wheel. Small-diameter wheels.
3. Step 3. Bicycle wheel — has part — Ball bearing. The wheel hub turns on ball bearings.
4. Step 4. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.
5. Step 5. Conveyor belt — is part of — Tunnel boring machine. Spoil is removed by a conveyor.
6. Step 6. Tunnel boring machine — evolved from — Tunnelling shield. A development of the tunnelling shield.

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