Titanium and rock drill: what they have in common

1. Step 1. Titanium — is material for — Artificial heart. The case is titanium.
2. Step 2. Artificial heart — has part — Piston pump. A pulsatile pump.
3. Step 3. Piston pump — has part — Piston. The piston draws in and pushes out liquid.
4. Step 4. Piston — is part of — Rock drill. A percussion piston.

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