Continuously variable transmission and tunnelling shield: what they have in common

1. Step 1. Continuously variable transmission — uses — Belt drive. A belt between pulleys of variable diameter.
2. Step 2. Belt drive — is used in — Conveyor belt. The belt runs around the drive and tension drums.
3. Step 3. Conveyor belt — is part of — Tunnel boring machine. Spoil is removed by a conveyor.
4. Step 4. Tunnel boring machine — evolved from — Tunnelling shield. A development of the tunnelling shield.

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