Tunnelling shield and joystick: what they have in common

1. Step 1. Tunnelling shield — evolved into — Tunnel boring machine. A development of the tunnelling shield.
2. Step 2. Tunnel boring machine — is made of — Cemented carbide. The cutters are cemented carbide.
3. Step 3. Cemented carbide — is made of — Tungsten. Tungsten carbide.
4. Step 4. Tungsten — is material for — Vibration motor. The eccentric weight is tungsten.
5. Step 5. Vibration motor — is part of — Gamepad. Vibration.
6. Step 6. Gamepad — evolved from — Joystick. A game controller.

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