Hub motor and aerosol can: what they have in common

1. Step 1. Hub motor — is part of — Mars rover. Hub motors.
2. Step 2. Mars rover — is made of — Titanium. The wheels and parts are aluminium and titanium.
3. Step 3. Titanium — is material for — Artificial heart valve. Titanium and pyrolytic carbon.
4. Step 4. Artificial heart valve — has part — Check valve. It works as a check valve.
5. Step 5. Check valve — is a kind of — Valve. A kind of valve.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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